What I did not try but might work: copy your persistence file, delete the old GW and create a new one with the persistence file you copied. Maybe the devices are preserved like this. Maybe you should create a full backup before... <edit: typo>

Hi :) does anyone know where i actually find the FT531IA? on aliexpress there are only FT531EA with output of 2.5V :(

@therik said: gw.send(msgVolt.set(batteryV, 2),1); Yes, this is correct.

i had good experience with it. . .

@therik I never really understood why the data was read this way in the pingpair sketch. Is keeps reading and overwriting data just read until there's nothing left to read. The pong sketch should just write 1 value for every value received, so there shouldn't be anything more to read anyway. Maybe on some boundary condition more data could come in, but I would prefer to read the value and flush the rest. Too bad flush Rx is not exported to public in current rf24 implementation...

@therik What about the first part of the scope chart, starting from 0 sec? What is the sketch doing there for more than half a second? It was reading temperatures, but for how many sensors?

The "Efficiency of Voltage Boosters" thread is full of useful info but has been sleeping for a year so this is an effort to bring it back to life again :-) I have built a few battery powered sensors based on the 328P-PU running at 8MHz as well as 1 MHz. Batteries used are common NiMH size AA + cheap Chinese 3.3V step-up converters. Both the processor and the radio are powered from the 3.3V converter which I understand can be a bad practice. Still I decided to try because I did not want to tamper with the fuses/bootloader at this stage and luckily I have so far not experienced any of the here described connectivity problems. More or less out of curiosity I made a few tests of this setup using different sizes of same brand electrolytic capacitors (nothing fancy, bought as a Velleman high-Q kit, labeled "made in Europe"). The results does not give more info than already available here but it helped me understand and hopefully can help others too. For the test setup a 10µF is soldered to the radio pins and I can add another in parallel through a socket. The unit tested is also equipped with both a 3.3 and a 5V step-up. A photo of the setup as well as a few screen dumps from an oscilloscope are attached as a pdf (hope it works). Readings are taken using a 8 MHz chip programmed as a motion sensor and while the sensor is at rest. 0_1462995658167_Tst.pdf Here is a short summary and a curve of same data: 10 µf dV 76 mV 10 + 22 µF dV 43 mV 10 + 47 µF dV 28 mV 10 + 100 µF dV 14 mV 10 + 220 µF dV 9 mV 10 + 470 µF dV 5 mV [image: 1462995740616-dv.jpg] A bigger capacitor of course lower the amplitude of the ripple (not unexpected :-)) and the rapidly falling curve shows that the current recommendation of 47 µF is a good choice. Adding more will lower the ripple but not at all proportionally. I am not experienced neither in building these battery powered sensors nor in measuring them why any comments/corrections will be appreciated.