Although not mandatory, I would personally add digitalWrite(Relay, LOW);
after pinMode(Relay, OUTPUT);
I am not sure I know enough to answer this correctly. I don't know how to turn on pins in the uno except by high/low . I checked this with my multimeter and it seems to work? I am all up for a better suggestion , I will make that change you depicted also, thank you.
@Woody Can I not just use my switch to power the uno? 12 volts coming to a switch, then switch to Vin on the uno? This would power my uno and then I connect via bluetooth to turn on my relay with button 3 from digital pin 12? The arduino program has deadman cut that works perfectly (thanks kas) and the sabertooth also has fail safe built in that works great also as i've tested both.
OK.... you need a solenoid rated @ 100 amps.
You will not find a 5v relay capable of 100 amps...so you'll need to use a 5v relay to work a second solenoid with 2 contacts ( both rated for 100 amps ) one for each motor.
YES?
Hence my statement ..
I think that your going to need 2 relays.
A 5V and a second... worked by the 5v relay ...rated @24v & 60 -100 Amp
woodygb:
OK.... you need a solenoid rated @ 100 amps.
You will not find a 5v relay capable of 100 amps...so you'll need to use a 5v relay to work a second solenoid with 2 contacts ( both rated for 100 amps ) one for each motor.
YES?
Hence my statement ..
Ahhh I see where you're going with this , do you have any recommendations?
I am using a solid state relay now but it's only good for 25 amps.
Edit:
I've done some searching on ebay for cheap relays and I think I can make it work . Here is my diagram let me know if you can think of a cheaper or better alternative ?
Personally I'd ALWAYS go with disconnecting the power at the battery supply to the ESC...( the ESC can then be be disconnected in the case of catastrophic failure ) ...I'd use a UBEC connected straight to the 24v battery to power the Arduino.
woodygb:
Fine ...just replace the two 12v motor relays in my drawing with the one 24v solenoid and use it to connect/disconnect the battery feed to the ESC.
I found a good deal on a 100 amp SSR , I added a heat sink and it worked great for 20 mins but I think it's toast as it no longer allows current to flow through and it appear to bottle neck the power to the motors as it wasn't as powerful as before . I'm ordering the solonoid and going to trigger it with a 5v relay. Thanks for the help.
kas:
No!! please do the math, a (rather) easy task
Hint: the +-100A sensor sensitivity is 20mV/amp
Im not sure I fully understand on what the actual equation shall be. At 512 ADC my formula should read
milliAmp = 243.664 * analogRead(Apin) - 124755.859; // (analogRead(Apin) * 4882.8125)/20 - 2500000/2
Then as amps increase (or decreases) it multiplies it by that variable ? Is this correct ?
what about my voltage telemetry formula? Did it appear to be correct? I can't test it until my resistors get here to confirm so I am only speculating.
Im not sure I fully understand on what the actual equation shall be. At 512 ADC my formula should read
milliAmp = 243.664 * analogRead(Apin) - 124755.859; // (analogRead(Apin) * 4882.8125)/20 - 2500000/2
Then as amps increase (or decreases) it multiplies it by that variable ? Is this correct ?
what about my voltage telemetry formula? Did it appear to be correct? I can't test it until my resistors get here to confirm so I am only speculating.
Volts:
using a 40k and 6k resistor for voltage divider :
voltage = analogRead(Vpin) * 0.037434895833; // (5.0/1024.0)*((40+6)/6) = 0.037434895833 V per ADC count
Before connecting sensors to your Analog Inputs pins, check with your DVM
-Amp sensor should supply 2500 mV when no current
-voltage divider should output 3130mV for a 24.0V input
Volts:
using a 40k and 6k resistor for voltage divider :
voltage = analogRead(Vpin) * 0.037434895833; // (5.0/1024.0)*((40+6)/6) = 0.037434895833 V per ADC count
Before connecting sensors to your Analog Inputs pins, check with your DVM
-Amp sensor should supply 2500 mV when no current
-voltage divider should output 3130mV for a 24.0V input
I'm not sure where I messed up , let me study this more . Thank you for the help and I will test it further with my dmm.
kas:
Before connecting sensors to your Analog Inputs pins, check with your DVM
-Amp sensor should supply 2500 mV when no current
-voltage divider should output 3130mV for a 24.0V input
Kas, for the amp sensor I am getting 1600mv with no current passing through the sensor.
