Car clock temp voltmeter

  
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This device was designed to replace the original digital clock in a Fiat Ducato 1992-1994, mounted just above the inside rearview mirror. The original clock is not very accurate, only displays time and is sensitive to interference (e. g. from Xenon headlights). The replacement device described here does not have these disadvantages, and on top of t
Car clock temp voltmeter - schematic

hat also displays the temperature and the car`s battery voltage. It works on the car battery and uses the Microchip MCP9800 as a temperature sensor. This circuit is based around the PIC16F1937 microcontroller. This chip is actually a small computer contained in a single chip, including RAM memory, EEPROM, I/O ports, CPU and so on. When you buy this chip, it comes empty with no program on it. You have to compile the source code and download the resulting machine code into it, using a PC and a small programmer attached to the PC and the chip. To get yourself familiar with this stuff, I suggest you first read this link: Getting started with microcontrollers. - First set the hours. Press and hold the button, the units of the minutes will increase until reached 0, then the tens of minutes will increase until reached 0, then the hours will increase. Release the button when the hours are correct. - Then set the tens of minutes. Press and hold the button, the units of the minutes will increase until reached 0, then the tens of minutes will increase. Release the button when the tens of minutes are correct. - Then set the units of minutes. Press and hold the button, the units of the minutes will increase. Release the button when the units of minutes are correct. 12V power coming from contact or light switch must be connected to PAD8. This is for the backlight, it will be on when the engine is running or when the light is on, by means...



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