I want to build one simple project with one Bluetooth HC-05, 2 transistors and battery to connect it to digital camera and take photos from Android.. Is there any simple chip for this project what do you suggest? What is the smallest battery for power supply? I want to make this device as tiny as possible..
ATtiny 25/45/85 (8 pin) or AtTiny 24/44/84 (14 pin). I'm not familiar with them and hence not sure if all pins of the x5 are available for use; x4 has more pins so a little more flexibility possible.
Get the smallest bluetooth module and the development software package for it and write firmware that does what you want. No need to use any Arduino.
Probably you won't need any external components, other than the battery.
// Per.
HC-05 is rather large, not sure what kind of signal you need for a trigger. How are you interfacing with the camera?
Just short 3 wires together with 2 transistor I think. FOCUS with GND and TRIGGER with GND.
If you have a Canon, (or probably any other camera) they have an android app to do what you want, and you even get to preview the image.
But, if this is just for the fun of doing...I suggest the flashing the firmware of the bluetooth module as said above.
KeithRB:
If you have a Canon, (or probably any other camera) they have an android app to do what you want, and you even get to preview the image.
I have Nikon D3100 and it doesn't support wifi or bluetooth as many other.. There are many gadget but the cost of BT is only 2 euro +2 euro battery and wires.
Zapro:
Get the smallest bluetooth module and the development software package for it and write firmware that does what you want.
How can you write firmware for HC-05?
dpiralis:
How can you write firmware for HC-05?
You can't able to write firmware for this one. The firmware belongs to the manufacturer and you can only able to upload a different firmware version into it. But I think what you mean is programming for it. Yes, you can by AT commands. You can set, check the communication speed, module name, operation mode, IO pins etc...
dgi52:
You can't able to write firmware for this one. The firmware belongs to the manufacturer and you can only able to upload a different firmware version into it.
Not correct.
OP can purcase CSR Bluecore suite and programmer and write firmware for the module. The CSR chips are very powerful and makes an Arduino look like a piece of toy.
// Per.