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| Digital Tach Page |
| From the introduction of the Light Emitting Diodes (LED) I have had a continuous interest and attraction to their use and visual effects. This picture was taken while trying to select the brigthest LED's for the digital tach. |
| This page contains pictures of the digital tachometer that I have been building from scratch for my son's 1999 Ford F150 XL pickup truck. The Idea of building a tach started about 1998 for an old 1979 F150 that my son and I were going to rebuild. Many things changed and he now has the newer F150 but it didn't come with a tachometer. |
| The tachometer is built using a Microchip PIC16C715 processor for the brains, a Maxium MAX7219 LED display driver, and two Micrel MIC4574 voltage regulators. The tach consist of three boards that fit into an AutoMeter 2-5/8" gauge pod that mounts to the window a-pillar. |
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| The middle board contains the display driver, microprocessor and op-amp. It also is home to a LM34CZ temperature sensor for internal temperature readout. |
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