OK. Did you try revving the motor up slightly, say to a fast idle of 1200-1800 RPM to see if it's just out of range? An out-of-tolerance cap might do that."no movement" meaning that it stays constant at 5.05v when the cars off/while starting and started.
I'm feeding a signal FROM the tach wire off the ECU to the chip.
Try the fast idle thing first. Then add the 10k resistor from pin 1 to pin 6.Still want me to put another 10k in?
Interesting - perhaps R5 is a bit large and/or C4 is a bit large.
Well i am happy to post that it worked with switching the 4.3k out for the 270k. its around 5v without starting and during starting its around 4.0v-3.25v then then it goes to .05v when started and stays steady.
Revving the engine would only keep the RUN/ output low. The thing to find out now is how low you can idle the engine before RUN/ rises. Try putting it in gear, turning on all the lights & A/C with the fan on high, and see if RUN/ goes back high.However, i did not rev the engine once it was started but im sure it should stay at the .05v?
Try 180k. If you do not get lower than 0.1v at RUN/ when the engine is idling with full load (in gear, lights/radio/AC/blower going full blast), then it is not enough resistance. If you DO get 0.1v at RUN/ when the engine is idling with full load (blah blah etc) then try 150k. We're looking for the threshold.Should i try changing the R5 again? The lower end of resistors i have are in the range of [27k, 33k, 39k, 51k, 56k, 68k, 82k, 120k, 150k, 180k, 220k, 270k, 330k, 470k]
C4 is currently around 0.1uF, and it may be a bit too large.Or should i change the C4? The Capacitors that i have handy are [100uF, 47uF] but they both are Electrolytic Capacitors.
Odd; you'd just tested it with a 270k the other day?Alright here are the results of the R5:
150k = 1.7v-1.8v
180k = 1.2v-1.4v
270k = Could not find them (
330k = .06v-.15v
470k = .06v constant
Thread starter | Similar threads | Forum | Replies | Date |
---|---|---|---|---|
S | ATmega168 Beginner MCU Help | Microcontrollers | 8 | |
W | FM Receiver Breakout with ATmega168 | Microcontrollers | 0 | |
R | help with ATmega168 programmer board | Programming & Languages | 21 | |
S | ATMega168 Tachometer help | Microcontrollers | 1 | |
S | ATMega168 Tachometer help using LM2907 chip | Microcontrollers | 70 |