Hi,
I would like to ask you if the power input of a syn115/f115 transmister can be an attiny85 pin output.
For example set attiny85 pin high and like this turn on the syn115.
Thank you
Hi,
Can you post the specs/data for a syn115/f115 transmitter?
Have you looked at the specs for a ATtiny85?
If you google attiny85 datasheet pdf
you should get a datasheet listing.
Thanks.. Tom... 
Hi Tom,
Thank you for your response.
Yes I did. However I'm a noob. I need to ask some more experienced.
Please find bellow a screenshot from the data sheet.
I Appreciate your help.
Hi,
Datasheet
Tom....
TomGeorge:
Hi,
Datasheet
https://www.rhydolabz.com/documents/33/SYN113-SYN115-datasheet-version-1-1-.0.pdfTom....
Hi,
Thanks that's the one i have.
I assume I can connect it like this, I mean power it from attiny pin.
Do you agree?
Thank you
Yes, but only if the ATtiny runs at 3.3V.
jremington:
Yes, but only if the ATtiny runs at 3.3V.
Yes I have 1 1.5v battery and I convert it to 3.3v(step up) . Thank you!
You mean "step down" converter.
jremington:
You mean "step down" converter.
Hi,
There is a space between the 1 1.5v.
It's 1 battery of 1.5V.
Thank you!
Hi,
You have 1 x 1.5V battery.. Okay.
Thanks.. Tom..
hi everyone.
it doesn't work.
I cannot even flash my attiny85 after soldering all parts.
If you see the attached image, it is a schematic of the transmitter. "VCC" is the PB0 of my attiny85.
If i solder only the attiny85 in the PCB i can flash it. After i solder either C1 or C6 or both then i cannot flash the attiny85(avrdude: Device signature = 0x000000).
I soldered all the components of my PCB and still doesnt work.Only if i desolder C1 and C6 then i can flash the attiny85.
What is the problem? When i had the same PCB only with a power distributor instead of connecting it directly to attiny85 ,it was working properly.
Thank you!
Next time put the chips into a socket and connect the wiring to the socket, so you can pop the chip out if needed or programming.
I keep some socket strips handy so I can have any length I need.
I get them from here
Hi,
So in that case I can program the chip first, then solder those two capacitors and test my board.
But what is wrong and it can't be programmed While everything is soldered? Why those two capacitors (even if 1 is soldered) prevent the chip from being flashed?
Thank you!
PB0 are the mosi pin on attiny85, so when you try to program the attiny you are driving the transmitter with the programmer...(and trying to charge those caps...)
use PB3 or PB4 for transmitter vcc instead
Best of luck
Thank you. Much appreciated your help
swe-dude:
PB0 are the mosi pin on attiny85, so when you try to program the attiny you are driving the transmitter with the programmer...(and trying to charge those caps...)use PB3 or PB4 for transmitter vcc instead
Best of luck
I just received the new PCB in which i use PB4 for VCC to syn115 chip.
Now if i solder the capacitors i can flash the attiny85.However if i solder the syn115 chip (f115), it wont flash again 
Any advices anyone?
Hi,
Have you actually breadboarded you project and got it going before going to a PCB and waiting for it to arrive?
Tom....
TomGeorge:
Hi,
Have you actually breadboarded you project and got it going before going to a PCB and waiting for it to arrive?Tom....
Hi,
No since I don't have all those components for breadboard. Also the 433mhz transmitter components wouldn't work on a breadboard. I don't think it would transmit anything.. So it wouldn't make sense to use a breadboard.
Any recomendations for flashing the attiny without having to unsolder the transmitter chip f115?
What programmer are you using?
Atmel had an application note on how to design on-board circuitry associated with the programming pins, so that ISP programming works properly, but I can't imagine why you would have a problem if those pins are otherwise unused.
Please post a proper schematic for the entire circuit.