my recent reads..

LEAP#290 The Boldport Club PissOff

The PissOff project was a great opportunity to play with hot-air reflow in a neat circuit involving an ARM Cortex M0, audio amplifier, and an SD card. As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub

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LEAP#289 Voltmeter-Ammeter LED panel module

This combined voltmeter-ammeter panel-mount module is a decent unit if you don’t need more precision than ±0.1V/±0.01A. It did take a bit of reverse-engineering and experimentation to get it calibrated, but once done the accuracy stays true within 1% over the full range. As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub hero_image


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LEAP#288 Basic Inverting Buck Boost Avr Control

Testing a very basic inverting buck-boost converter controlled by an ATtiny85. The basic inverting buck-boost circuit uses an inductor to build up an electromagnetic field during the switch-on period, and dump this energy into the capacitor during the switch-off period. The diode provides steering. As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub hero_image


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LEAP#287 Ultrasonic Alarm

The HC-SR04 Ultrasonic Ranging Module is commonly used with a microcontroller for obstacle detection and other autonomous control functions. But that doesn’t mean it can’t be used in circuits that lack a processor. Silicon Chip featured an article by Jim Rowe in the Dec-2016 edition that described Using An Ultrasonic Sensor Module As A Door Sentry, so I built something similar! As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub


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