The circuit is based on PIC16F819 18-pin microcontroller which has an analog-to-digital (A/D) input to monitor the battery voltage and outputs capable of driving LEDs directly, to keep the component count down. There are seven LEDs in all, giving a good range of voltage indication. The topmost LED, LED1, comes on for voltages above 14V [...]
The PCBs and/or a complete kit for this project can be purchased trough the Nuts & Volts Webstore. From magazine: Nuts&Volts September 2008
This circuit lets an external 12V SLA battery power a camcorder which normally has an inbuilt 7.2V battery. Such batteries can now be very difficult or expensive to obtain for earlier model camcorders. In essence, the circuit is a standard LM317 adjustable regulator with resistors R1 & R2 set to provide 7.2V (depending on the [...]
In this microcontroller project, Guido Socher design a state of the art USB programmer for the AVR microcontrollers from Atmel. You can build it from scratch without the need of another programmer to load the initial firmware.The firmware is open source and programmed in C according to the AVR068 specification from Atmel. Source: tuxgraphics
This circuit is for detecting any audio signal with justable noise offset. It could be used to generate a radio mute signal eg. from a PDA. The circuit is consisting of: – Input impedance – Signal amplifier – Rectifier – Justable comparator (Noise offset). Download: Schematic Source: KKelektronik-4u
This is a mini inexpensive AVR Digital Voltmeter Project with three digit display. It can be freely programmed, calibrated and even be programmed with a non linear formula. It’s a display where you can define the relation between the measured value and the displayed number. Download: Software, documents and future updates Source: Tuxgraphics
This white-LED driver circuit is ideal for use in a garden light. It automatically turns the LED on at night and runs from a single 1.2V nicad cell which is recharged by a solar cell during the day. Diode D1 allows the solar cell to charge the battery during the day and prevents it from [...]
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