BruceMe
Well Known Member
I'm handy with electronics and I'm sick of killing my battery because I forget to turn off the master... I know, this is a "millenial problem" like FADEC and glass panels. But it's getting old and a $5 circuit can fix it.
Requirements:
Design
Use a micro-controller connected to a sensitive vibration detector that resets a one-hour timer. After one hour of near-total-non-movement or 2 seconds of holding the power-switch; then collapse the power supply and de-energy the master solenoid. An LED would indicate "On" when solid, blink when in some state of turning-off.
It would be installed in place of the master switch on an aircraft and could be built using a single LED momentary switch.
Components;
I'll post an updates as I'm building and when it's done.
Requirements:
- Must not accidentally turn off on final after a long flight (simple timer)
- Must have very-very low current when off (<1pA)
- Be cheap and reliable
- Avoid failing-off... ie if it dies, stay on
Design
Use a micro-controller connected to a sensitive vibration detector that resets a one-hour timer. After one hour of near-total-non-movement or 2 seconds of holding the power-switch; then collapse the power supply and de-energy the master solenoid. An LED would indicate "On" when solid, blink when in some state of turning-off.
It would be installed in place of the master switch on an aircraft and could be built using a single LED momentary switch.
Components;
- ATTINY85 (8-pin micro controller)
- sensative vibraswitch
- LED Power Switch
- 3.3 volt regulator
- P-Channel MOSFET
- NPN transistor
- 5 - Resistors
- 2 - Capacitors
I'll post an updates as I'm building and when it's done.