See more detail in my blog: https://jeonlab.wordpress.com/2019/03/06/attiny85v-binary-thermometer-with-auto-power-off/#comment-1807
- This is a modified version of the Flashing Thermometer that is originally
- made by David Johnson-Davies - http://www.technoblogy.com/show?ZSX
- David's brilliant original version
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- Power saving by utilizing sleep mode of ATtiny85V
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- Negabinary to show negative temperature in celcius
- My modified version
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- Specially designed 2 BJT transistor auto power off circuit (disconnect battery)
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- Normal binary system: less digits & easy to convert
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- For negative temperature: both LEDs blinks briefly before flashing positive number
- Hardware:
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- ATtiny85V: 1 MHz internal oscillator, BOD disabled
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- 2x LEDs
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- 1x PNP TR (2N3906), 1x NPN TR (2N3904)
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- 3x 1k resistors
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- 1x 0.1uF cap
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- 1x push button switch