of a thoughtless copy/paste from telefireeight. So ..
- remove R11
- - change the value of R15 to something slightly higher
+ - change the value of R15 to something slightly higher, 26.1k
- rename sense_1 to sense_pyro
- rename sense_pyro to sense_armed
- connect sense_batt to U13 pin 2, the comparator - input
- connect sense_armed to U13 pin 3, the comparator + input
- connect U13 pin 1, comparator output, to RPI pin 32, GPIO12
- - connect sense_pyro to ADS8688 input 2, pin 21
- - connect sense_batt to ADS8688 input 3, pin 23
+ - connect sense_batt to ADS8688 input 2, pin 21
+ - connect sense_pyro to ADS8688 input 3, pin 23
This means we're using 4 of the 8 ADC inputs for
chamber pressure