Vermes
Advanced Member level 4
In winter, accumulators sometimes cause problems. It is a simple voltmeter, which signals the voltage at the battery terminals.
Signalling is done using 3 LEDs:
- green flashing: U>14,5V (overload)
- green lighting: U>14V and U=<14,5V
- green and yellow lighting: U>13.5 and U=<14V
- yellow lighting: U>13V and U=<13.5V
- red and yellow lighting: U>12.5V and U=<13V
- red lighting: U>12V and U=<12.5V
- red flashing: U<12V (discharge)
Yellow round LED signals powering the system after stabilizer 7805.
The program was written in BASCOM and takes about 99% of processor memory.
The board was designed in Eagle and made in thermal transfer method (laser printer + chalky paper + iron). All was protected from oxidation with Plastik70 varnish.
Photos:
Link to original thread – Woltomierz samochodowy na Attiny13 (wskaźnik naładowania akumulatora)
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