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John Guy

EE by trade, hacker for fun

Huntington Beach, California

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This user joined on 05/07/2016.

My Projects

A very useful test fixture to convert the voltage or impedance seen on its input to a variable frequency audible tone

Beeper Box: Analog V2F

Woody is a scratch built quad wheel bicycle with four passenger capacity, with electric power to assist pedaling.

Woody the Electric Four Passenger Bicycle

I had seen recent efforts to use 2N3904 and 2N3906 transistors to make an audio power amplifier. This is my take on this exercise.

LIL' BUDDY AUDIO POWER AMPLIFIER

Things I've Built

Charlie the Unicorn Bike

A magical bicycle, Charlie!

Projects I Like & Follow

Low cost PID servo drive for small CNC machinery

Brushed DC Servo Drive

Raspberry Pi Zero Ledstrip Controller to control a RGB ledstrip via the browser of your phone or pc.

Raspberry Pi Zero Ledstrip Controller

marcel-brouwers Marcel Brouwers

Re-configurable Sub-1GHz RF remote control with BLE & USB. Can receive, transmit & analyze RF spectrum.

GollumRF: Sub-1GHz RF hacking tool

Supplyframe DesignLab: 2023 Hackada…

Differential scope probe

PD150

Reverse-engineering (mostly-)cheap eBay finds

Avionics + mil-spec teardowns

don-straney Don Straney

An ultra-low noise amplifier (named EmoeNAP) capable to measure low-noise LDO/OPA's wide band output noise, and many other applications

Take a 'NAP' and enjoy a moment of silence

Upgrade of Cobra CB for use in New Zealand and to interface with a car stereo.

Cobra 19 DX IV Upgrade

A minimal 4-wire milliohm meter with 4.5 digit display

SDO Milliohm Meter v1

kuba-sunderland-ober Kuba Sunderland-Ober

The reason of newly coming ARM based Arduino has gray terminals is not fashion but non-5V tolerant !! Here is an solution!!

Salvaged : Full 5V-tolerant Arduino ZERO compat.

Just add smart-phone. MobBob is a walking, talking, seeing, listening robot companion that you can 3D print and build for around USD$30.

MobBob - Smart-phone powered robotic companion

kevin-chan Kevin Chan

HID USB relay based on ATTINY45 with optoisolated inputs

USB relay for Raspberry Pi, Windows ...

First Wi-Fi + Bluetooth HAT for Raspberry Pi with 40 pins at an affordable price, get rid of your wires, here comes the IoT HAT by RedBear

IoT HAT for Raspberry Pi Zero and more

Operate your appliances (almost any of them) via an android app interface. Just click on a button to switch them Onn or Off.

Home automation

himanshu-sharma Himanshu Sharma

Convert an ordinary USB keyboard into a foot controller with 21 buttons suitable for use with live music software.

Footcontroller Keyboard

tina-belmont Tina Belmont

Grove-compatible breakout board for Arduino Nano with Serial, Digital, PWM, Analog and I2C

GroveHat for the Arduino Nano

gergely-imreh Gergely Imreh

The 2015 Hackaday Prize

A toy and app made for anyone to learn to code. Wireless drag-and-drop coding and our friendly iPad tutor. Think Lego meets the IoT!

Wireless, drag-and-drop programming for hardware

The 2017 Hackaday Prize

Original design v-tail quadcopter, all pieces 3D printed. 2213 935kv motors running 10.5 inch props with a 4400mah battery.

Raptor V-Tail Quadcopter Drone

The 2016 Hackaday Prize

It is absolute great Arduino board !!!!

D21XXXL arduino M0 Zero compatible XXXL board

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