130 Pi: Electronics for the Raspberry Pi Computer (130.html)

(To enlarge .....Click it) Raspberry Pi 3B

(To enlarge .....Click it) Raspberry Pi 4B

(To enlarge .....Click it) Raspberry Pi GPIO (pre model 4B) [NOTE: GPIO20 is mislabelled in above photo as phys pin 37]	(To enlarge .....Click it) pi4B GPIO
(To enlarge .....Click it) pi4B GPIO v2	(To enlarge .....Click it) GPIO_Pi4B_Alts.jpg

I2C_Pi4B_Pins.jpg

Some Electronic Components for the Pi (many are I2C) circa August 2019

• connect to the GPIO pins on the Raspberry Pi 4B,
• allow the user to select at least one specific I2C channel (of the 6 on the Pi model 4B),
• include the isolation (and voltage level shifting) provided by the ISO1541 chip and
• offer connection to one or more of the following:
  • SparkFun I2C qwiic connector
  • NCD NodeLynk I2C Interface connector
  • the solder pins on the many Adafruit i2C devices
  • other 4 or 5 pin female connectors
  • other 4 or 5 conductor cables

• PoE Rectifier for Jack J4

There are 802.3af add-on boards (see photo below) available for the GL-AR150 Wi-Fi router for just USD$8 or so. For more details, see source 27. This article also states "A quick search didn't show anyone selling the Power over Ethernet (PoE) board itself, only with the router." Below on the right, is a PoE injector cable, that puts DC voltage on the unused conductors in the Ethernet cable. It is Sparkfun product number CAB-10759 for $5.50. A voltage adapter is needed as a source of this DC power. Jumpers are needed within the Raspberry Pi to conduct the voltage to any device or breadboard needing the DC voltage.



(To enlarge .....Click it) PoE Rectifier

(To enlarge .....Click it) 10759-01.jpg

• Raspberry Pi PoE HAT

The small board shown below (and described in Source 36) is only available from Raspberry PiHut in the UK for £18 (18 pounds sterling). It permits a Raspberry Pi computer to be powered over the Ethernet network. It also includes a very small fan that is software controlled to regulate the temperature of the Pi computer.

(To enlarge .....Click it)

Pi PoE hat


• REF5020 Voltage Reference

For more details, see source 19. This voltage reference can also provide a 5 volt supply for low power circuits connected to it. There is a reference to the use of the REF5020 in the DAC8574 circuit below.

(To enlarge .....Click it)

REF5020.jpg


• DAC8574 i2C 4 Analog Output Lines
A video (Source V03 below) explains how to use the DAC8574.


(To enlarge .....Click it)

DAC8574 i2c 4 Analog Output Lines


• DAC8571 i2C 1 Analog Output Line (with remote voltage sensing)

Texas Instruments offers an evalution module for the DAC8571 (see Source 16 below). After power-up, the device works in low power mode with its normal power consumption of 170 uA at 5 V. At fast settling mode, device consumes 250 uA nominally, but settles in 10 us. For the three power-down modes, the supply current falls to 200 nA at 5 V (50 nA at 3 V). Not only does the supply current fall but the output stage is also internally switched from the output of the amplifier to a resistor network of known values. This has the advantage that the output impedance of the device is known while in power-down mode. There are three different options: The output is connected internally to GND through a 1-k? resistor, a 100-k? resistor or it is left open-circuit (high impedance). The output stage is illustrated in Figure 32.
A power on reset starts the DAC8571 in the low power mode. Low power mode and fast-settling mode settings stay unchanged during DAC8571 data updates, unless they are specifically overwritten as explained in Table 6. On the other hand, each new data sequence requiring a DAC update brings the DAC8571 out of the three power-down conditions.
DAC8571 power settings can be stored in the temporary register, just like data (use C<7:0> = 0000 0001). This allows simultaneous powerdown capability for multichannel applications.
This is explained in more detail in the spec. sheet in Source 17 below.



(To enlarge .....Click it) DAC8571 Diagram

(To enlarge .....Click it) DAC8571_PowerDown.jpg

• ADS1115 I2C 4 Analog Input Lines with Differential Inputs

A spec sheet for the ADS1114 (and 5) can be found in Source 13 below. The ADS1115 is available mounted on a small printed circuit board (shown below) from AdaFruit (see Source 15). This tiny Adafruit board, with solder terminals at 1/10 inch centers, also contains the appropriate resistors and capacitors.

A block diagram of the ADS1114 and 5 is shown below;



(To enlarge .....Click it) ADS1114/5 Diagram

(To enlarge .....Click it) ADS1115_ada

• ISO1541 i2C Isolation chip

For more information watch the YouTube video (V03) below. A spec. sheet is available at Source 20. The ISO1541 mounted on a board with 2 4 pin male connectors is available from NCD (Source 21) for $29.95. Power is isolated using a 100ma Mornson switcher regulator isolated power supply. A less expensive way to use the ISO1541 on a breadboard is to solder it to a an empty adapter board (Sparkfun #13655) shown below.


(To enlarge .....Click it) ISO1541.jpg

(To enlarge .....Click it) ISO1541_I2CBH_1KV_1-1.png




The INA301 LS or HS Current Sensor (INA260 is an I2C version)

This measures current through a tiny shunt resistor by "Outputting" an amplified voltage that is proportional to the current that is sensed. The shunt resistor can be on the Low Side (LS) or the High Side (HS) of the load. The load's voltage can be as high as 36v DC.
It also outputs an "Alert" (an interrupt) when the measured current exceeds a threshold level. The "Alert" takes only 1 micro-second. The threshold is set by an external variable resistance (or voltage). A variant of this chip provides 2 threshold comparators. A "Reset" line is provided to reset (cancel) the interrupt.
This chip is available with factory-set gains of 20 V/V or 50 or 100. (V/V means output voltage per volt of input.)
An evaluation module is available from ti.
Alternate chips eg INA260 exist that include the shunt resistor.


(To enlarge .....Click it) INA301 Voltage & Current Sensor

(To enlarge .....Click it) INA301B Voltage & Current Sensor B

Go to Source 4 (ti) for more information about this current monitor chip.

INA260 is an I2C version (sensing Current,Voltage & Power) of the INA301

Refer to Source 29 for the INA260 Data Sheet. The internal shunt resistor is 2mOhm. That is 2 milli-ohms. It can sense bus voltages from 0v to 36v. It reports Current, Voltage and Power.
(To enlarge .....Click it)

INA260 Diagram


TL082 Op Amp

Refer to Source 11 for the TL082 Data Sheet. The voltage gain of this Op.Amp circuit is -R2/R1.
(To enlarge .....Click it)

TL082 Dual Op Amp


sn74hc138 DeMultiplexer

See Source 3 below for a PDF tech sheet for this chip.
A circuit using the SN74hc138 is shown below:
(To enlarge .....Click it)

SN74HC138 Demuliplexer


MPL3115A2 Barometric Pressure/Altitude/Temperature Sensor

(To enlarge .....Click it)

1893-02.jpg


VEML7700 i2C Lux Sensor

From Adafruit for $4.95

(To enlarge .....Click it)

4162-04.jpg


Adafruit 2159 i2C Yellow-Green Quad Alphanumeric Display

From Adafruit for $10.95. Is there a code library for running this on a Raspberry Pi? See Adafruit Forum issue cited in Source 18 below !!!!



(To enlarge .....Click it)

2159-02.jpg


items from Universal Solder

US PN Prio Description                             Price $Cad Date Rec'd
****** ** ********************************************* ***** ************
#26357 Hi 3 shunt resistors 0.002 , 0.01, 0.1 ohm	$2.95 May 21, 2019
#26135 Hi USB Volt amp meter				$7.98 May 21, 2019
#26355 Hi CP2102 USB-TTL serial adapter 3.3v/5v 	$3.79 May 21, 2019
#26334 Hi I2C MCP23017 16 channel GPIO Expander		$6.49 May 21, 2019
#26012 Hi 12 piece long lead shield headers		$4.98 May 21, 2019
#26349 Hi Bread Board Power Supply 3v & 5v		$3.39 May 21, 2019
     (NB Ground is NOT the center pin of the power input connector)
#26320 Hi 2 pcs Wemos D1 perfbd proto.. shield		#3.39 May 21, 2019
#26227 Hi 10W + 10W stereo audio Class-D [PAM8610]	$2.99 May 21, 2019
     (NB The volume can only be controlled via input amplitude control.)
	

PAM8610 Class D audio Amp 2x10watt

(To enlarge .....Click it)

PAM8610 board
For Spec Sheet see Source 5. Universal Solder PN 26227

TPA2016 i2C 2.8 watt Class D Audio Amplifier control

Adafruit pn 1712 for $9.95. Perhaps this device can be used as a pre-amplifier for the PAM8610.

Inside the miniature chip is a class D controller, able to run from 2.7V - 5.5VDC. Since the amp is a class D, it's incredibly efficient (89% efficient when driving an 8 ohm speaker at 1.5 Watt) - making it perfect for portable and battery-powered projects. It has built in thermal and over-current protection but we could barely tell if it got hot. This board is a welcome upgrade to basic "LM386" amps!

(To enlarge .....Click it)

1712-00.jpg


Arduino Ethernet Shield (Sparkfun # 11166)

The Arduino Ethernet Shield (#11166 from SparkFun for $24.95) logs data in a similar format to previous Arduino Data Logging Shields. More information appears in Source 6 below. The following photo shows that the new format logs 3 data fields instead of the former 2 fields. The Arduino Data Logger Shield uses a Real Time Clock (RTC) to time-stamp the log entries that it stores on an SD card. This new format excludes the high-resolution time field (milliseconds since the program began). In contrast, the PiR2 data log can always be produced by any Raspberry Pi because the Raspberry Pi already has a real-time clock and SD card. The PiR2 time-stamps agree with the world clock, when the Raspberry Pi is connected to the ethernet.
(To enlarge .....Click it)

Arduino Ethernet Shield Log


This format can easily be interchanged with the PiR2 log format defined and used by the author of the MehInCharge.com (MIC) website (Source 7). To see the MIC log format; click on the menu item named "Log" at the MehInCharge.com website.

T2301PB Triac

The obsolete T2301PB triac / thyristor (equivalent to the LittleFuse L2004F31) is described in the spec. sheets; Source 11 and Source 12 below. The YouTube presentation V05 (below) describes how such a Triac can be optically isolated and used to control 110v AC. The photo below is the circuit diagram for this triac.

(To enlarge .....Click it)

T2301PB Circuit


MOC3034M Opto-Isolater

The diagram above shows the MOC3034M controlling a T2301PB triac. The diagram below shows a MOC3021 driving a Triac to control a 220v motor. See Source 14 for a datasheet about the MOC3021. In the diagram below, the "red sin wave in a circle" is the source of 220 v (AC).

(To enlarge .....Click it)

MOC3021 Circuit


DS3502 i2C 10k Digital Potentiometer

This device lets the microcontroller set the resistance of the "wiper" to any of 128 values.

(To enlarge .....Click it)

4286-03.jpg


NCD I2C Mini Extender Board

The NCD I2C Mini Extender Board joins 2 I2C cables. It costs $3.95 from NCD. It has 2 I2C NodeLynk Interface 4-pin male Molex Compatible connectors (which each cost $.10 . Cables (3 inches long) cost $0.95 each.

The SparkFun Qwiic Adapter (for $1.50) is similar to the NCD Extender, but the Qwiic adapter is probably slightly different than the Molex connector. The 50mm (2.2 inch) Qwiic cable (below - right) costs $0.95 .



(To enlarge .....Click it) I2CEXT_A_1-600x400.png

(To enlarge .....Click it) 14495-01.jpg

(To enlarge .....Click it) 14426 Qwiic Cable

Outward facing I2C port from NCD for the Raspberry Pi

It has a male and female 40 pin connector for some models of the Raspberry Pi. It provides an I2C cable connector that is level-shifted to 5v. It is available from NCD for around $11.00 . An inward facing version also exists. The active components on this device have an unknown purpose, but they may unfortunately draw 5 volt power from the Raspberry Pi. If so, this device does not isolate the I2C devices from the Raspberry Pi. Some photos show this device with a 26 pin GPIO header, so beware when ordering from NCD.



(To enlarge .....Click it) OUTPI2_B_2_480x480.png

(To enlarge .....Click it) OUTPI2_RevA.png

VL53LOX i2C Distance Sensor from Adafruit

This sensor from Adafruit senses distances between 50mm and 1000mm (1 meter) with very high resolution.
(To enlarge .....Click it)

VL53LOX Distance Sensor




SparkFun SOIC to DIP Adapter - 8-Pin

It is available from SparkFun (4 for $2.95). See Source 22 for instructions how to solder an 8-pin SOIC chip.
(To enlarge .....Click it)

13655-01.jpg




SparkFun pHat i2C for the Raspberry Pi

The Qwiic pHat from SparkFun (for $5.95) plugs into the Raspberry Pi GPIO pins to allow connection of 4 sets of I2C devices (all on the same i2c bus (unfortunately not for the Pi-4B multiple i2c buses).
(To enlarge .....Click it)

15351-SparkFun_Qwiic_pHAT_for_Raspberry_Pi-01.jpg




Adafruit 801 Pi Plate

The Adafruit (for $15.95) plugs into the Raspberry Pi GPIO pins to allow connection to only the top 26 GPIO pins via a breadboard device, some perf-board devices and even a 16 pin SOIC surface mount chip.
(To enlarge .....Click it)

Adafruit 801 Pi Plate




Adafruit I2S MEMS Microphone

The Adafruit Product # 3421 (for $6.95) is an I2S (not I2C) microphone without any analog output. It can be used by the Arduino and the Raspberry Pi.

Instead of an analog output, there are three digital pins: Clock, Data and Left-Right (Word Select) Clock. When connected to your microcontroller/computer, the 'I2S Master' will drive the clock and word-select pins at a high frequency and read out the data from the microphone. No analog conversion required!

Source 25 describes a circuit (shown below right) to test the MEMS Microphone on a Raspberry Pi. A Fritzing file is available in Source 26 from Adafruit for the MEMS microphone.It uses GPIO lines 18,19 and 20 which are physical pins 12, 35 and 38 respectivedly. For BCM read GPIO.



(To enlarge .....Click it) Adafruit I2S Microphone

(To enlarge .....Click it) Adafruit I2S Microphone Pi Test Circuit





Sparkfun MEMS Mike + Amplifier (# BOB-9868 US$10.95)

This tiny breakout board features the ADMP401 MEMS microphone. One of the key advantages to this breakout and microphone is the bottom ported input. This means the microphone's input can fit flush against the enclosure of your project. Plus you will not have to deal with trying to solder the microphone's wacky footprint. Wootness!

The amplifier on the breakout has a gain of 67 and more than meets the bandwidth requirements of the mic. The amplifier's AUD output will float at one half Vcc when no sound is being picked up. The amplifier produces a peak-to-peak output of about 200mV when the microphone is held at arms length and is being talked into at normal conversational volume levels. So the AUD output can easily be connected to the ADC of a micro. For hookup instructions see Source 57.

(To enlarge .....Click it)

Sparkfun # BOB-9868


AliExpress MEMS I2S Disc US$ 1.80)+ shipping

From AliBaba store # 1916536, the Omnidirectional Microphone Module I2S Interface INMP441 MEMS High Precision Low Power Ultra small volume for ESP32. Shipping to Canada will cost US $1.07. The letters "441 CCV238" are written on the IC can. By the way, clicking on the "Play Triangle" (below) won't respond.

(To enlarge .....Click it)

MEMS_I2S_Circle.jpg

An alternate supplier is "Superseller For Arduino&3D". See Source 58 for more details.

Adafruit Pico HAT Hacker

The Adafruit Product # 3577 (for $2.50) permits access to all 40 pins of the Raspberry Pi.

(To enlarge .....Click it)

Adafruit Pi Hat




Raspberry Pi Camera (from Adafruit)

The Adafruit Product # 3099 (for $29.95) includes cable for the Raspberry Pi.

(To enlarge .....Click it)

Pi Camera v2




MCP4725 ($1.25 from Rainbowsemi at Alibaba, $4.95 from Adafruit)

MCP4725 is a single channel, 12-bit, voltage output Digital-to-Analog Converter with integrated EEPROM and an I2C Compatible Serial Interface. See Source 32 for more information.

(To enlarge .....Click it)

mcp4725-768x768.jpg




1 Wire Plus (£14.00 L14.00 (14 pounds sterling)

The 1 Wire Plus (Source 36) provides an I2C port and a 1-Wire(R) port for a Raspberry Pi. It stacks the GPIO pins and provides: I2C solder pins, 1-Wire(R) is via an RJ-12 connector (similar to an ethernet connector), allows external 5V source, 2 bit address and other 1-Wire(R) features. It is available from the UK PiHut and is compatible with 1-Wire(R) devices manufactured by MAXIM. The 1-Wire(R) system is used in a portable iButton form, sometimes called a Dallas Key. For more details see the 1-Wire(R) PiZero addon (next). Many 1-Wire(R) devices incorporate unique serial numbers to identify the device that is communicating. It uses a MAXIM DS2482-100 (Source 44) IC to convert I2C to 1-Wire(R) controls.

(To enlarge .....Click it)

1 Wire Plus




1 Wire PiZero addon (£13.00 L13.00 13 pounds sterling)

This board provides I2C and 1-Wire(R) ports for a Pi Zero computer. See schematic in Source 45. It is similar to the 1 Wire Pi Plus, but is smaller and is compatible with the Pi Zero. A detailed tutorial (Source 38) has been written by Jack Creasey, author of Raspberry Pi Essentials, for the setup of One Wire File Systems (OWFS) with the 1 Wire Pi and 1 Wire Plus boards. For more information about OWFS see Source 46. Unfortunately, the RaspberryPi forum contains many comments of 1-Wire(R) devices not working under Raspbian (but they work elsewhere under Python). Apparently Owserver and owlib don't work satisfactorily (as of 2015). OWFS on GitHub (Source 46) doesn't show much activity. The range of 1-Wire(R) devices can be seen at Source 39. Individual 1-Wire Devices can be looked up in the MAXIM product list (Source 41). For example, search for "Sensors". One example of a 1-Wire(R) device, a temperature sensor (MAX31820 for US$2.26 (Qty 1) from Mouser Electronics), can be seen in Source 40. Its form is similar to a small plastic NPN transistor. There is a growing number of 1-Wire(R) sensors: temperature, voltage, humidity, light, ultraviolet, pressure, thermisters, thermocouples, programmable microcontrollers, relays, lights, LCD panels, etc. Source 47 describes how to set up the OWFS with I2C support on Raspberry Pi Zero. Source 48 is the (Linux) man page for OWFS.

(To enlarge .....Click it)

1 Wire PiZero addon




MAXIM DS28E17 ($2.17)

This device DS28E17 (Source 42) permits a computer (eg Raspberry Pi ?) to use 1-Wire(R) technology to communicate with distant I2C devices. This reduces the wiring costs to remote areas where multiple I2C devices can be employed.

(To enlarge .....Click it)

DS28E17




Raspberry Pi 40 Contact Solder Tag Board (L2.99)

This 40 pin Tag Board from "thepihut" facilitates wiring of GPIO pins to a "solderboard".

(To enlarge .....Click it)

40 Pin Tag Board

Pi 4B J2: RUN and GLOBAL_EN Pins

J2.jpg

Wed Jul 10, 2019 5:02 pm

RUN is for resetting the SoC. GLOBAL_EN is for signalling the PMIC to leave the low power shutdown state. Neither should be used for powering a fan.

Fri Oct 05, 2018 2:36 am

The Run pin (well its not really a pin as it isn't populated) is directly connected to the Broadcom SOC according to the reduced schematics (Source 34).

The RUN signal appears to be an active-high, pulled-high, open-collector configured signal on both, so you could probably just use a diode to interface to an external 5V/0V signal to pull it low as /RESET -

                        -.- 3V3
                        .|.
                        |_| 10K
External     Diode       |
 signal   >---|<|---(o---^---<> RUN

COM-10302 Tactile PushButton 12 for $5.85 From SparkFun

Tactile_Button.jpg

See3CAM_130 works on Pi 4B From e-consystems.com US$99

Zoom-See3CAM_130.jpg

Modern HC Logic Gates

SN74HC21N.jpg

Raspberry Pi Zero W Surveillance Camera Project

• Pi Zero W US$10
• Pi Zero Cam for the Pi Zero £15
• Pi Bow Zero Case £5
• 32 GB Micro SD Card US$10

Part Number and Price List

PN    Desc              	Price
--    ----              	-----
RaspberryPiModel4B 1Gb		$35.00
RaspberryPiModel4B 2Gb		$35.00
RaspberryPiModel4B 4Gb		$55.00
PoE Rectifier			$ 8.00
CAB-10759			$ 5.50
REF5020 Volt. Ref
DAC8574 i2C 4xA.O.
DAC8571 i2C 1xA.O.
ADS1115 i2C 4xA.I.
ISO1541 i2C Isolation		$29.95
INA260	i2C Curr.Sens.
TL082 Op.Amp
SN74HC138 DeMux
MPL311582 Outdoor.Sens.
VEML7700 i2C Lux Sens.		$ 4.95
2159 i2C 4 Alpha		$10.95
PAM8610 Audio Amp.
TPA2016 i2C Aud.Amp.		$ 9.95
Arduino Eth.Shield		$24.95
T2301PB Triac
MOC3034M Opto.Iso
MOC3021 Opto.Iso
DS3502 i2C 10k Pot.          CAD$ 7.99 (from ADAFRUIT)
DS3502U i2C 10k Pot.            $ 6.50 (from MBM at AliExpress)
NCD i2C Ext.Board		$ 3.95
NCD OUTPI2 i2C port		$11.95
VL53LOX i2C Dist.Sens.
SOIC to DIP Adapt.		$ 2.95
pHat i2C for Pi			$ 5.95
Pi Plate			$15.95
MEMS micro. I2S (not I2C)	$ 6.95
MEMS Mike + Amp #BOB-9868	$10.95
3577 Hat Hacker			$ 2.50
3099 Pi Camera			$29.95
MCP4725 i2C DAC			$ 4.95

PriceList.txt

List of Suppliers of Electronics (current & former suppliers)

Raspberry Pi 4B Support

if you want a stable and easy solution simply install mate in raspbian:

apt-get update
Install mate
sudo apt-get install mate-core mate-desktop-environment
Add mate as default environment for your user by adding this line
sudo update-alternatives --config x-session-manager
In the wizard, type the number corresponding to mate
Reboot
sudo reboot
:grin:
Cheers Uwe

Glossary of Electronic Acronyms

1K0       1 K ohm resistor
1-Wire    OWFS serial bus
2GB       2 Gigabytes
3V3       +3.3 Volt
6K0       6,800 ohm resistor
ada       AdaFruit
ADC       Analog to Digital Converter
ALT       Alert (usually an interrupt signal)
BCM       BroadCom Inc.
CDS       photo cell (CadmiumSulphide)
CMOS      Complementary Metal Oxide Semiconductor
DAC       Digital to Analog Converter
DIP       Dual In-line Pins (a popular IC format)
GND       Ground
GPIO      General Purpose Input/Output Raspberry Pi pins
Grove     I2C connector with 4 pins
HC        logic gates using CMOS levels
HDMI      High Definition Multimedia Interface
HS        High Side (of the load)
iButton   Dallas Key
I2C       Inter-Integrated Circuit eg TMC102
I2S       Inter-IC Sound (eg Adafruit MEMS microphone)
IC        Integrated Circuit
IIC       I2C
LS        Low Side (of the load)
MIC       Meh In Charge (www.MehInCharge.com)
Mux       Multiplexer
NCD       National Control Devices, LLC
Op.Amp    Operational Amplifier
OWFS      One Wire File System
pcs       pieces
Pi        Raspberry Pi Computer
Pico      Pi Pico microcomputer on a board
PiR2      PiR2 Area Controller by ICH180R2 Corp.
PN        Part Number
PoE       Power over Ethernet
pot.      potentiometer (variable resistor)
qwiic     Qwiic Connect System by SparkFun Electronics
RTC       Real Time Clock
SD        Secure Digital Card (memory card)
SoC       System-On-Chip  eg Broadcom BCM2711
SOIC      Small Outline Integrated Circuit (very small IC Package format)
ti        Texas Instruments
TTL       ICs using very old Transistor-Transistor Logic
us        micro-seconds
USB       Universal Serial Bus
v/v       output voltage per volt of input

References

Books/Newspapers

YouTube Videos

INA301 Volt & Current Sensor

ti TL082 Op Amp

Pi2 Fun with I2C DAC's and ADC's

Installing Arduino Libraries

T2301PB Triac

Raspberry Pi Zero W Surveillance Camera

Web Sites

theBreadBoard by Peter

w3 Schools IS reference

sn74hc138 Multiplexer (pdf)

INA301 current monitor

PAM8610 Audio Amp (pdf)

Arduino Data Logging

MehInCharge.com website

Universal Solder catalog (pdf)

MCP23017 Data Sheet (pdf)

TL082 Data Sheet (pdf)

RCA T2103PB Triac Data Sheet (PDF)

RCA T2103PB Triac Data Sheet (local PDF)

ADS1114 (local PDF)

MOC3021 driving a Triac that controls a 220V motor.

AdaFruit ADS1115

DAC7571, DAC6571, DAC5571, DAC7574, DAC6574, DAC5574, and DAC8571 Evaluation Module by ti (pdf)

DAC8571 Spec Sheet (pdf)

Adafruit Forum Issue: 14segment alphameric featherwing - i2c problem

REF5020 Voltage Reference Spec Sheet (pdf)

ISO1541 Spec sheet (pdf)

ISO1541 on board

Adafruit - How to solder a SOIC chip.

Sparkfun - How to solder a SOIC chip.

Element14

MEMS I2S Circuit for Raspberry Pi Use

MEMS I2S Fritzing file for Raspberry Pi Use

Raspberry Pi IEEE 802.3af addon

MehInCharge.com website

ti INA260 Current & Voltage & Power I2C sensor

Element14

10 best Raspberry Pi Sensor Kits

MCP4725 DAC Tutorial (pdf)

Raspberry Forum topic

Pi Partial Schematic

Run/global_en: Raspberry Forum topic

1 Wire Plus

1 Wire PiZero addon

Pi and 1-Wire Tutorial

The range of 1-Wire(R) devices

MAXIM MAX31820 Temperature Sensor

MAXIM 1-Wire(R) products eg Sensors

MAXIM 1-Wire(R) products eg Sensors

MAXIM DS28E17 1-Wire to I2C converter

MAXIM DS2482-100 I2C to 1-Wire converter

1 Wire PIZero addon Schematic

OWFS on GITHUB

[Set up] OWFS with I2C support on Raspberry Pi

[Set up] OWFS Man Page by paul.alfille@gmail.com

Ubuntu Mate for the Raspberry Pi 3 (and soon for the Pi 4 B)

Ubuntu Mate for the Raspberry Pi 4B

50 Sensors Etc. for the Raspberry Pi

Raspberry Pi 4 power button

SN74HC21N Dual 4-Input Positive-AND Gate

Ultra HD USB camera for Raspberry Pi 4

motionEyeOS Software

Notes for motionEyeOS project (Source V06)

MEMS Microphone Hookup Guide (for BOB-9868)

MEMS Microphone for Arduino

DS3502 I2C Digital Pot: Overview for Arduino

DS3502U I2C Digital qwiic Pot

WebMaster: Ye Old King Cole

Click here to return to ePC Articles by Old King Cole

Created 2019 H Aug 21
Updated 2024 B Feb 26
© ICH180RR Corp

/130.html