You can put 100uf on each even 200uf would not be able to handle only one tx, so..
but you need them at least for coin cells.
you would need more capa to handle tx..but the more capa the more time they take for recharging, and the recharging if big, increase internal res of the coin cell and that's not so good too; to prevent this that would need a current resistor limiter..etc a whole balance!
On mine for instance, I have 100uF for coincell, 100uF for PIR and 86uf on radio. Fresh varta coincell 3.02V, after multiple presentation tx 2.85V if I remember, not so bad. but that's an homemade pcb.
Another notes, it's better to use ceramic capacitor (because of leakage, if you want to optimize), and better smd, but that's not your case I think.
The warmup time of the MH Z19b is 3 minutes. So 2 is probably fine, but you could probably do 3 just in case. Although 2 would save your more battery time.
Do you mind explaining your setup a bit more? I would love to do something similar but I do not know where to get started with the PIC microcontroller!
I don't want to assume your knowledge level. However the truth is that you will probably need to put together different bits and pieces from various threads in order to come up with your own custom solution (the A/C interface (IR) part, the battery part, etc...).
Maybe it is worth it to create your own new thread, or maybe you want to keep researching / trying on your own a little longer first. The latter is admirable, and is the way I usually do it, too. Some times to a fault in my own case. Don't suffer along in silence if you are struggling to find the information, make a thread instead. If it becomes too difficult you may give up. We all need some small successes along the way to keep motivated and keep it fun.
Probably best to create a new thread (I don't want to derail this one too much) but something you might want to look into is OpenMQTTGateway. I use it for my 433mhz, but it also supports RF, BLE, LoRa (and perhaps others in future) all on the same gateway! To me that was the way to go... And so far has been flawless for me.
So, while here I've decided to close my TODO list. The revision 1.4 is likely to be the last chapter in this design, and now it can be considered safe to order. It introduces some important final touches to the board, in particular:
The orientation key (diameter 2.1mm) on the board edge. It's located between the Tag-Connect and the board main area, and initially can be used as an eyelet. After the Tag-Connect removal it works as an orientation key for the board.
Full rework of the silk layer. Just to mention few: I hid all designators and decorated the board with eye catchy "52" over the nRF52 MCU, touched the antenna outline, and moved the git hash to the mainland.
Review and cleanup the ground plane. The changes were tiny so it shouldn't detune the antenna, but aesthetics were definitely improved. You may also want to order the board in Afterdark colors now:
@alexsh1 the reason i am using the 18650's is the fact i have a steady stream of them coming in for my large battery packs. I have a couple hundred that aren't dead but just aren't quite up to to the standard i am putting in my big packs.