I have a high altitude balloon project - See the last one here -> **broken link removed**
Looking at the diagram below - my gumstix computer (with GPS) will periodically read telemetry data over the radio; using text to speech.
This is the optoisolator - SparkFun Electronics - Opto-isolator Breakout
This is the relay - SparkFun Electronics - Relay SPDT Sealed - Mini
When I want to transmit the gumstix turns the GPIO port on (from no power to 3.7 volts / 80 milliamps)
That takes the circuit between OUT1 and the power on the battery to 7.4 volts and 10 milliamps. Not enough to throw the relay - DRAT!
If it did throw the relay then the Push to talk on the radio would be closed and my radio would transmit. After reading telemetry data the gumstix would then turn the GPIO off and that would open the PTT back up on the radio.
Am I exceeding max power inputs on the opto isolator? Is the 10 milliamps output on the opto isolator what I should be seeing?
Eventually I will be using this wiring to ignite a rocket motor (on a separate battery) so I want the opto isolator to prevent damage to the flight computer when firing the rocket motors.
Does this make sense
Help - This is only my second project and I majored in Literature
**broken link removed**
Looking at the diagram below - my gumstix computer (with GPS) will periodically read telemetry data over the radio; using text to speech.
This is the optoisolator - SparkFun Electronics - Opto-isolator Breakout
This is the relay - SparkFun Electronics - Relay SPDT Sealed - Mini
When I want to transmit the gumstix turns the GPIO port on (from no power to 3.7 volts / 80 milliamps)
That takes the circuit between OUT1 and the power on the battery to 7.4 volts and 10 milliamps. Not enough to throw the relay - DRAT!
If it did throw the relay then the Push to talk on the radio would be closed and my radio would transmit. After reading telemetry data the gumstix would then turn the GPIO off and that would open the PTT back up on the radio.
Am I exceeding max power inputs on the opto isolator? Is the 10 milliamps output on the opto isolator what I should be seeing?
Eventually I will be using this wiring to ignite a rocket motor (on a separate battery) so I want the opto isolator to prevent damage to the flight computer when firing the rocket motors.
Does this make sense
Help - This is only my second project and I majored in Literature
**broken link removed**