Miniature LED Matrix driver board

Tiny battery powered ultra low power arduino (atmega328p) compatible sensor module with a RFM69 radio module.

The purpose is to mount these devices inside wall light switches (instead of a normal mains switch) and send a wireless signal to a gateway if someone presses a button. The gateway forwards the received message to a home automation module to initiate the appropriate action (e.g. turn on/off the corresponding light or wall plug or…). Up to 4 different switches can be connected to a single device. The device also has a small SMD piezo buzzer on-board, so audible feedback is possible (e.g. gateway did not acknowledge the transmission). Normally, the device also sends a “i’m still alive” message at regular intervals containing current battery voltage. This allows for quick and automated detection of faulty devices and monitoring of link quality.

Battery life is estimated >40 years and is based on an average of 5 message/hour non-stop (=120 presses/day avg) and a 1200mAh Li-SOCl2 battery (self discharge is accounted for). Deep sleep current is measured to be <300nA, waking up and sending a message is measured to consume about 1400uJoule of energy. This ultra long lifetime is only possible with Lithium Thionyl Chloride batteries.

Since this device is battery powered and generates no heat, it is completely safe to mount in any type of wall (or outside or…).

The zipfile contains the gerber files and a pdf with the current schematic, BOM, board assembly views, dimensions drawing, drill info, 3D model… Full documentation, firmware and 3D printable enclosure is still in development and not (yet) included.

Changelog:

v 1.0 Original version (works and tested OK)

v 1.1 Small hardware modification to reduce power consumption when a button is pressed or locked

Passive relay board for switching speakers. 3 balanced & 2 unbalanced outputs with jumpers for each additional output & an insert for a balanced to unbalanced converter. An optional capacitor for switch circuit.

Source at github

This is a backplane PCB for Digitabulum. When combined with the PowerPlant, it has the same schematic as the r2-Backplane.

Intended usage

This board is intended as a testing harness for functional subunits designed for use with the Digitabulum sensor package. This would be the board you would want for prototyping new CPLD designs, power supplies, or compute modules.

If you do not want to do those things, but just want a working glove, you should use the r2-Backplane instead.

The CPLD GPIO pin has been routed to the 2v5/3v3 selection signal.

Features

• ESD protection diodes for ingress-resistant USB port.
• Supports full software management of battery.
• Supports reduced-voltage operation and full power down of the sensor package for maximum battery longevity.
• JTAG breakout for in-circuit programming of CPLD.

Adafruit SOIC/TSSOP to DIP breakout

https://www.adafruit.com/product/1208

Rev B of IRM-10/IRM-20 breakout board (footprints in data sheets were upside-down).

An LM317 which is programmable via Serial TTL.

Gate Controller V2.0. Dual I/O

Relay board2

RPi GPIO breakout

Untested board of LoRa node with RFM95 and SAML21 microcontroller.

ESP8266 WiFi to 433MHz RF bridge

Project information on hackaday.io: https://hackaday.io/project/63004-esp433-wifi-to-433mhz-bridge

Converts 230V to 5V and 50Hz to 1Hz. Test. It might not work. IC1, IC2, IC3 - CD4027BE IC4 - CD4068BE

See https://github.com/pepaslabs/lt1763

This is a development board project for ATtiny85 microcontroller. The board is designed to work on a breadboard. The board contains the basic components required for the functioning of the microcontroller. All pins are on one side and are designed to be easily combined with boards, that contain 5 LEDs.

Schematic

RPUlux

Controller board with six AL8805 constant current drivers connected to PWM pins of an ATmega328p. Analog channels ADC0, ADC1, and ADC2. ADC0 and ADC1 also have an N-CH MOSFET that may be used to sink a few amps of current. Two 22mA current source for various task. ADC6 measures input voltage (7 thru 36V DC) and ADC7 measures input current. SHLD_VIN that can power a shield may be disabled with IO2 (so it can power off a Pi Zero on the RPUpi shield)

GitHub Forum Forum HackADay

This is not 100% tested, do not order it and expect it to work 100%! DEVELOPMENT ONLY!