Charging Lopy4

[Majdoulina makbal]

Hey , in the expansion board documentation , what do they mean by 'To use the battery, pull P8/G15 high (connect to 3v3). If you want to use the SD card as well, use a 10k pull-up.'
How can i connect 3v3 to P8 please ?

[Gijs]

Im not aware of anything wrong with the tx_power argument from here: https://docs.pycom.io/firmwareapi/pycom/network/lora/#lorainitmode-regionloraeu868-frequency-tx_power-bandwidthlorabw_125khz-sf7-preamble8-coding_rateloracoding_4_5-power_modeloraalways_on-tx_iqfalse-rx_iqfalse-adrfalse-publictrue-tx_retries2-device_classloraclass_a

Though note that the transmit power argument for LoRaWAN is defined per region

[Majdoulina makbal]

Thanks for your reply.
So if i understand well if we only want to power a pycom on a battery there is no need to connect P8 to 3v3 .
I have another question regarding tx_power. is there any new update in lora library that allows setting the tx ? or at least checking it ?(im using lopy4)

[Gijs]

I see its worded confusingly. I believe what they meant, is if you want to use the SD card reader while only powering it using the battery, you will need to pull-up P8 using a 10K resistor( P8 --> 10K resistor --> 3v3). Though I remember @robert-hh also had a remark about this some time ago..