microcontroller

load resistance

Rechargeable Battery Capacity Tester using ATMega168 microcontroller

Do you have a pile of AA rechargeable batteries in your drawer? Some are old, some are new, but which sets would you bring with your camera on your next trip, and which ones are past their useful life? I like using rechargeable batteries, but I’m certain that some of them are not living up to …

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power supply circuit (1)

1 Watt White LED Power Supply Circuit for battery operation Using Atmega

Download FreePC project file, gerber and png copper and silk-screen: 1wattledbuck.zip Introduction I have some 1 watt warm white LEDs left over from a project and the application for them was obvious: A better battery operated lamp for use when the power fails, which it does frequently, especially during the rainy season. And this one should …

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LED1 (1)

Single and Two Cell White LED Drivers Without Inductors Using Atmega

Three inductor-free circuits that allow a white LED or UV LED to be driven from one (1.5 volt) or two flashlight cells (3 volts total) are described. The circuits on this page are: The two cell (3 volt) circuit four transistors. The simple single cell (1.5 volt) circuit requires six transistors, but it isn’t as …

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lv boost

Series Connected Voltage Boost Circuit for a Battery Operated LED Lantern Using Atmega

Photo. This is the test circuit -the basic driver is only two transistors, two resistors, the circuit was evaluated using a white LED, but when it was time to button it up and archive it, I replaced the expensive white LED with a cheap green one. Othere LED Driver Circuits on this site: White LED …

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wall mounted (1)

White LED Battery Powered Power Failure Light Using Atmega

Overview Where I live most of the time, the AC power drops out upon occasion. This used to leave me groping around in the dark for a flashlight. I could have bought a battery-backed up “emergency light” for about US$35, but being basically metal boxes with floodlights attached, they would make my living room look …

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Overvoltage protection

An NRF24L01+ and FTDI Ready Atmega 328P-PU (3.3V, 500 MA) Microcontroller With Dual Power Capability, Undervoltage, Hysteresis, and Thyristor-Crowbar Overvoltage Protection

This board is designed to safely drive a 3.3V microcontroller and connected accoutrements. It supports primary and backup power sources and provides numerous over and under voltage safeguards. The microcontroller here is a bare-bone, no-frills Atmega 328P-PU with no leds, driven by a 16 MHz crystal. An 8-Pin female connector is wired up to the …

An NRF24L01+ and FTDI Ready Atmega 328P-PU (3.3V, 500 MA) Microcontroller With Dual Power Capability, Undervoltage, Hysteresis, and Thyristor-Crowbar Overvoltage Protection Read More »

FAST PWM CHARGER CIRCUIT

NIMH NICD BATTERY FAST PWM CHARGER CIRCUIT ATMEL AVR

Battery charging circuit atmel attiny26lp based on switched PWM works as a fast charge is doing the switching circuit 100UH coil and irf5305 irl3803 MOSFETs used charging current of 300 mA, 600 mA ……Electronics Projects, NiMH NiCd Battery Fast PWM Charger Circuit Atmel AVR “avr project, battery charger circuit, microcontroller projects, “ Battery charging circuit atmel attiny26lp based …

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