Electronics Geeky stuff here. A collection of hobbyist electronic projects I have done over the years. Many have been presented at the monthly meetings of the PIC Club, the Programming SIG which is part of the Sydney PC and Technology User Group where I'm a member. Alarm Circuit for PC Parallel Port Interface an alarm circuit to the PC parallel printer port. PICAXE Temperature Sensing with LM335 Monitor temperature data in a GUI with Autoit. Interrupting the PICAXE SERIN Command Use a slave PICAXE to interrupt SERIN command on master PICAXE. How I built my quiet and cool PC Step-by-step guide to peace and quiet at home. Alpha System Environment Monitor Temperature sensing on an Alpha box. HAPSIM and the AVR Studio Simulator Fake LCD, LEDs, Push-Buttons and Keypad in AVR Simulator without hardware. USB interface on an ATMEL ATtiny45 Software implementation of the USB protocol on an ATtiny45. .NET Micro Framework Programming Fez Panda II microcontroller with C# and Visual Studio. Experimenting with DIY PCB My experiments in making a PCB using photoresist method. Experimenting with DIY PCB - Toner Transfer More experiments in making a PCB using toner transfer method. Waveshare 4.3" E-paper display Test-drive the demo code of this cool e-paper display. DIY Arduino Tutorial Make your own Arduino and waste time and money doing it. PAM8403 3W Stereo Amplifier Simple amplifier using a $1 PAM8403 chip from ebay. LED Work Lamp and Switch Conversion Use cheap LED lights for work lamp. Convert latching switch to momentary Blow the wall! A simple rocket shooter game using a 16x2 LCD, Arduino and a co-op task scheduler. Laser Cutting Making a bamboo ply key chain with a laser cutter. Amateur Radio Listening to Waverley Amateur Radio Club Monday night chat on UHF band. Arduino Pro Mini with nRF24L01+ 2.4GHz radio Connect an nRF24L01+ transceiver to an Arduino Pro Mini and run some test sketches. RS232 to TTL serial adapter Make an RS232 to TTL serial adapter similar to the Sparkfun FTDI Basic board but using a MAX233 chip. Tooltips A collection of time and money-saving tools and tips for the electronics hobbyist. DIY USBtinyISP-compatible AVR programmer An ATTINY85-based programmer for the Atmel AVR chip family similar to Adafruit's USBtinyISP. Convert a 5V Arduino Nano clone to run on 3.3V No hardware board modifications required, just change the USB supply. EBD-M05 Mini Electronic Load Tester The Zketech EBD-M05 is a mini electronic load for testing battery and powerbank discharge. A simple hack enables voltage and current to be measured during charging as well. STM32 development boards revisited The STM32 dev boards have always been a bit of an underdog in the hobbyist world. Fast, cheap and easy-to-install: pick the first two only. Let's see if things have changed lately. Simple USB sound system for PC A typical USB sound system for PC consists of 2 speakers with built-in amplifier and power adapter. Get rid of the adapter and free up a power outlet with this project. LED Flip Switch powered from USB Modify the LED Flip Switch from Bunnings to use USB instead of battery power. Control video game camera movement with thumb joystick Video games typically use the WASD keys to control an 'invisible' overhead camera which represents a player's overview of the battlefield. This project uses a joystick with an Arduino Pro Micro to emulate a HID keyboard instead. Battery-powered Raspberry Pi with pan/tilt camera A portable Raspberry Pi 3B+ with a camera mount that can manually pan or tilt. Uses 6 x AA Nimh batteries and a high-efficiency DC-DC converter to step down to 5V. Ceiling lamp holder with remote control Modify a standard batten lamp holder with a 433Mhz remote control switch from ebay.