Tim a vampire toy DIY into a convenient timer

I have been thinking about it early, I have been thinking about the vampire toy that I am a child, and the horrible smile is transformed. The front time suddenly came, so I turned it into a timer. Video effect display: Change the wiring I cut off the button wire on a small motherboard and re-weld Attiny13 so that it triggers a toy when receiving the signal to the button. There are two cases here, one is triggered by a low level, one is triggered by high level (A and B), check the wiring and the corresponding annotation / cancel the annotation definition, the same applies to various LEDs. My toy is valid at a low level (button connection wire from the solder point to the negative battery lead), and the other wire is connected to the positive battery lead, and then the level is pulled down to light them. Another part is defined as high level (buttons connected to the positive electrode of the battery). "Calibration" and EEPROM The Attiny13 internal oscillator is not accurate, it depends on the voltage and temperature, it needs to be calibrated. In the case of me, when the countdown is set to 25x60 tick (should be second), it is actually 28 minutes and 32 minutes. "Calibration" has nothing to do with the actual oscillator calibration, only the counting tick is 5 minutes and multiplied the result by 5. The default tick count has been saved / read from EEPROM. When you upload an image for the first time, you will need to write EEPROM if you use PlatformIO. $ PIO RUN - Target Uploadeep To calibrate the timer, set your phone timer to 5 minutes, start the two timers, but before the second flash, do not release the Toy Time Button. After the phone timer is started, press the Toy Timer button, which multiply the tick 5 and saves this number to EEPROM. The above is the toy transformation of me, I hope everyone likes it. Be Source: HackADAY.IO The original content of the circuit city is not allowed to reprint!

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