50Hz square wave generator for VATs/Passkey
My weekend project: create a circuit that would create a 50Hz square wave signal to feed into the ECM/PCM on a 1990's caprice to circumvent the vehicle anti-theft system. Solution? A couple of capacitors, resistors, and a 555 timer. Result: the car runs like a dream. More to come.
posted by Bryan at
10:21 PM
2 Comments:
I need to build a similar square wave oscillator - do you have the values for the R1/R2/C1 components?
July 9, 2008 9:17 AM
I should have done a better job of documenting this.
Here you go, a site for reading resistor codes:
http://www.samengstrom.com/nxl/3660/4_band_resistor_color_code_page.en.html
R1 = 10,000 Ohms
R2 = 100,000 + 33,000 = 133,000 Ohms
Capacitors: Both are 0.1 microfarad
You are wiring the 555 timer to be astable. Here's a good tutorial on that:
http://www.csgnetwork.com/ne555timer2calc.html
With those values plugged into this calculator, this gives a 52.283 Hz wave with a 51.812% duty cycle. Hope it helps!
July 9, 2008 11:40 AM
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