John's microcontroller projects

John keeps busy and exercises his brain and hands by making microcontroller devices. For inquiries and comments: saunj227@iCloud.com. Please no ads.

He usually makes a nice oak cabinet for them.

This is a window fan which switches on when it gets cooler outside
This is a battery charger for NiMh and gel-cell batteries
This uses a very old parallel keyboard with a new life with PICAXE projects.
This is both an altimeter and a barometer depending on the code.
This is a Alpha-Numeric LED display demonstrating keyboard control and real-time clock.
This is used for measuring rechargable batters.
I took a very old Nixie clock off the shelf and reworked it with a PICAXE
This uses a cheap clock to time the program and sum the charge increments.
A logger with an opto-isolated current input, analog meter, and SD Writer.
A 10 cps mechanical counter with a choice of voltage or contact-closure input.
A PICAXE refurbishes a 40-year old autoranging Volt-Ohmmeter.
Automatic switches to save standby power in my entertainment centers
Several devices using simple AM TX/RX modules for lighting control
Several devices using simple AM TX/RX modules for data communications
A display using 600 mostly green LEDs in a 12 x 50 matrix.
A Battery Charger for 12-volt Gel Cells.
A 2-input voltmeter with serial output
A constant-current regulator for driving high-power LEDs illuminating curios only during evening hours
A device to quickly sort transistors according to polarity, pinout, and chemistry
A mobile environmental logger using an 18M2
An Analog/Digital data acquisition system
A replacement Spa Thermostat using a 14M2
Displays the spa or ambient temperature
A big LED clock made from junk
A self-contained battery-operated systen for acquiring, viewing and recording analog and serial digital inputs .
A mobile logger using an Ardurino
A replacement using a 14M2 for a 19-year-old discrete IC wire-wrap board
A thermostatically-controlled Exhaust Fan.
A 2.1 AH 8-cell NIMH battery and stepped charger with load compensation
A Solar Charging System
5, 2.1 AH 5-cell NIMH batteries in series with picaxe control using themisters and a charger.
A standalone AC wattmeter measures true watts from 20 to 2000 full-scale. it also measures and displays current and line voltage, and accumulated watt-hours
This is the wooden Art-Deco cabinet of a 1941 GE model LCP-609 AM tube radio, with entirely modern electronics inside.
A comprehensive system for continuously displaying and recording security events and environmental measurements.

Picaxe 08M/M2 Picaxe 14M/M2 Picaxe 18-20X/M2/X2 Picaxe 28X1 Stamp II Ardurino No micro

The PICAXE Basic code for these projects is here