Discrete 4-way 8-bit bus selector

4-input bus selector/multiplexer built from discrete transistors and resistors.

MySensors - DS18B20 temperature sensor

This is a bare minimum DS18B20 based temperature sensor node.

It is intended to be as small as possible, with really long battery life. The ATmega328P is powered directly from the battery, but the nRF24L01+ and DS18B20(s) are powered through an efficient XC6206 3.3v LDO regulator (U2). The battery can be 3x AA/AAA, or a LiPo/Li-ion cell (i.e. 18650).

This uses the SMD version of the nRF24L01+ module.

All resistors/capacitors are 0805 sized with the following values:

• R1 - 4.7kOhm
• C1,C2 - 4.7uF - 10uF
• C3,C4 - 100nF

The ATmega328P MCU needs to be programmed before being soldered, so the MYSBootloader is recommended.

MYSNodeRS485 rev001

MySensors Node RS485
ATmega328 + MAX485

D7 pin used for control RS485 DE/RE input.

On long side of board present 11-pin header include:

D2, D3, D4, D5
A0, A1, A4/SDA, A5/SCL
GND, 5V

On short side of board present two pin header include:

5V, GND, D2, D3 (for simple connect sensors like DS18B20, DHT22)
RES, TX, RX (for connect UART)

Present place to solder pull-up resistors for RES, D2, D3, SDA, SCL signals.
It is also possible to install LED connected between D6 pin and 5V through 510Ohm resistor.

Adafruit ItsyBitsy M4 Express featuring ATSAMD51

https://www.adafruit.com/product/3800

Gerber_[pnbhjok_20190424173310

nrfmicro

Arduino Pro Micro-sized Bluetooth board with Li-Po charger and USB Type-C support

LM399 Basic Board

Basic LM399 Board. Please see for more info:

https://github.com/pepaslabs/basic-lm399

Voltage Reference

Dual Synchronous Step-Up DC/DC Converter Breakout Board

Dual Synchronous Step-Up DC/DC Converter Breakout Board
Rev. 1
Initial revision
Tested, works fine

AP2112M 3.3V-regulator with TXB0104 logic level shifter

AP2112M 3.3V-regulator with TXB0104 logic level shifter.
Breadboard-compatible pin headers.

Minimum components:

• AP2112M (4-SOIC) and TXB0104 (14-SOIC)
• 4 capacitors (2 x 1uF in 1206, and 2 x 0.1uF in 805)
• one pull-down resistor (in 805)

See https://github.com/vladbelous/ap2112m-txb0104-module for full schematic and details.

USB-C FTDI Programmer

USB-C FTDI Programmer
Rev. 1.2
Improved version. Additional LED added to the schematic, indicating the availability of power supply provided to the module.
Tested, works fine.

current_probe

Power Supply Adapter

Power Supply Adapter
Rev. 1
Tested, works fine.

TVL61225 Breakout Board

TVL61225 Breakout Board
Rev. 1
Not tested yet, waiting for delivery

RPi3B+ RAK833 PoE HAT Rev.1.3

RPi3B+ RAK833 PoE HAT
Rev.1.3
Not tested yet, waiting for delivery

SHT35-D High Accuracy Humidity and Temperature Sensor Breakout Board

SHT35-D High Accuracy Humidity and Temperature Sensor Breakout Board
Rev. 1.2
Rearranged pin header to meet better the accepted standards (thank you @wijnand)
Not tested yet, waiting for delivery

USB-C FTDI Programmer

USB-C FTDI Programmer
Rev. 1.1
Initial revision
Tested, works fine.
One more LED will be added to the next revision, which will indicate availability of power supply, provided to the module. In the current revision, only two LED's are available, blinking when the module is in the data transfer mode.

USB dual rail power supply

A little dual rail (±12 volt) power supply board powered from USB

SHT35-D High Accuracy Humidity and Temperature Sensor Breakout Board

SHT35-D High Accuracy Humidity and Temperature Sensor Breakout Board
Rev. 1.1
Initial revision
Not tested yet, waiting for delivery

TQFP-32 Breakout Board

TQFP-32 Breakout Board
rev.1.1
Initial revision
Tested, works fine.

Banana Ruler v1.3M

Metric Version
PCB rulers are all the rage these days so I decided I should make one of my very own. I present to you the "Banana Ruler" for whenever you need to check to see if your banana is in spec.

Let me know on Twitter if you have some of these made. It's great to see them measuring weird and wacky things.

Banana Ruler v1.2M

Metric Version
PCB rulers are all the rage these days so I decided I should make one of my very own. I present to you the "Banana Ruler" for whenever you need to check to see if your banana is in spec.

Let me know on Twitter if you have some of these made. It's great to see them measuring weird and wacky things.

Eurorack power screw terminals adapter

A power supply connector for Eurorack modular synthesizer connected to a block of screw terminals, so you can:

• Power your Eurorack synth modules by putting power into the screw terminals OR
• Breakout of the power supply rails from a Eurorack power supply (or power bus board) by using the screw terminals as power outputs

Also, there are some LEDs to indicate when power is present.

iot_harvester_bq25570

ESP12 Breadboard Pogo Pin Jig v2

ESP12 Breadboard to Pogo Pin Adapter. Pogo pin holes are 1.14mm, so they should accept 1mm diameter pogo pins. Outer holes accept 3mm screws in case you want to sandwich two PCBs together for stability.