Transistor switch to short a camera switch - resistor values - Raspberry Pi Forums

hi,

i'm hoping can me? i'm trying trigger old camera using gpio pins on raspberry pi b+, in order trigger shutter need short 2 contact points on switch (i've soldered 2 wires contacts , connected them perfboard).

short switch i'm trying use transistor (a bc547) wired follows:

- gpio pin 6 (pin 31) connected base via 1k* resistor
- 2 wires connected switch connected emitter , collector

* value of resistor example saw online

2 wires of switch have 6v between them camera (when measure multimeter) , when connect switch transistor, measure 4.7k resistance between them.

problem: when put gpio pin "high" camera doesn't fire (and crashes pi). based on description, able tell me i'm doing wrong? should 1k resistor different value? there better way achieve i'm trying do?

i'm going around in circles on , i'm concerned i'll damage pi if values wrong, assistance appreciated!

thanks,

adam

you need @ least wire raspberrys gnd emitter. how should (otherwise) base-current find it's way back? aware of potential-differences if there other connections between camera , raspberry. (may via common powersupply or ever.)

think isolated solution, example aqv252 or such ...

greetings, fm_81

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