Shared Projects

A low-cost sewable addressable RGB, for those who don’t mind SMT soldering.

Components: 1x WS2812B LED 2x 22 Ohm 0603 resistors 1x 0.1 uF 0603 capacitor

This board is a mini panel of four, so each order contains 12 dots.

This is a battery powered test fixture which converts the voltage or impedance seen at its inputs to an audible tone, about 200Hz to 1.6kHz. Power comes from three AAA batteries, and the unit turns itself off an on automatically. Power consumption in standby is TBDµA, and when making a 200Hz tone the current is TBDmA. With 20 minutes of use per day, 5 days per week, 50 weeks per year, the batteries should last TBD years, but of course the batteries' self-discharge will likely force their replacement within a few years.

PIC 18F programmer shield for Arduino pro micro. You can find FW and programmer at the github. https://github.com/hanyazou/a-p-prog

This is a small board to experiment with the STM32H503, a 250 MHz ARM Cortex-M33. The board will fit into a Arduino Nano socket, though it is only partially compatible with the Nano pinout. The KiCad project, BOM, and firmware are on GitHub. The firmware consists of a small command-line interpreter for testing boards, and uses the on-chip USB to communicate with a virtual terminal on your PC.

This is a replacement PCB for SNES controllers using readily available off-the-shelf parts with a focus on being hand-soldering friendly.

Features:

• Works just like the original, but better protected against ESD damage.

• OPTIONAL LEDs!

• OPTIONAL SOCD filter circuit for D-pad input.

Assembly instructions, BoM, and other documentation can be found on the main project site or in the public Bitbucket repo.

A breakout for RFM69CW HopeRF radios designed as a shield for Arduino Uno. It is notoriously difficult to connect HopeRF radios, which are 3v3 devices, to Arduino, which are 5V devices. The 47uF and .1uF capacitors in this design have worked for me.

guserNRF

Test Board of the Beavis Audio Noisy Cricket circuit.

CHRP4 is a versatile and inexpensive microcontroller development system designed to help anyone learn how to make simple line-following, obstacle sensing, or Sumo robots.

CHRP4 is a robot focused derivative of UBMP4, and was designed for learning or teaching PICmicro programming for robotic applications using either Microchip’s MPLAB X IDE or the cloud-based MPLAB Xpress IDE. Its USB bootloader allows CHRP4 to be programmed in C using almost any device – including Chromebooks!

CHRP4 Hardware Features

• Microchip PIC16F1459 USB-capable microcontroller with 8k words of program FLASH (6k words free when using the USB bootloader), 128B of user FLASH, 1kB of RAM, 10-bit ADC, and a built-in temperature sensor
• optional SN754410 (or L293D) quad half-H bridge motor driver to run two DC motors in forward and reverse
• optional LF50AB low drop-out regulator for 6-12V battery operation
• 5 built-in pushbuttons
• 5 visible light LEDs
• 1 piezo beeper output
• optional 4-pin header for PORTC I/O pin expansion (designed for an HC-SR04 ultrasonic SONAR module, but can also connect to servos, optical sensors, NeoPixels, etc.)
• optional IR LED and phototransistor circuits integrated on three mini, break-away boards (one designed for line following robots, two designed for general floor sensing)
• optional IR demodulator for remote control decoding
• USB 2.0 type-C port for power and programming
• 6-pin ICSP (In-Circuit Serial Programming) header for PICkit-4

Go to mirobo.tech/chrp4 for more information.