<![CDATA[SIM800L power supply]]>SIM800l problem with voltage. Modul SIM800L work with 3,4-4,4 VDC but M5 product give 4,9V. At this voltage the module does not connect to the network. To change it , I used MP2307DN step-down converter, but it is hard to set optimal voltage. I haved luck and set on 3,85V. 20240808_193957.jpg

]]>https://community.m5stack.com/topic/6689/sim800l-power-supplyRSS for NodeWed, 29 Apr 2026 12:22:26 GMTFri, 09 Aug 2024 14:49:03 GMT60<![CDATA[Reply to SIM800L power supply on Fri, 09 Aug 2024 15:08:05 GMT]]>Hello @Kris

thank you for sharing your solution. With 5 V supplied from an external power supply I actually measure about 4.7 V going to the SIM800L due to the voltage drop of diode D1. But yes, that is still out of the specified VBAT absolute maximum rating of 4.5 V.

Thanks
Felix

]]>https://community.m5stack.com/post/26042https://community.m5stack.com/post/26042Fri, 09 Aug 2024 15:08:05 GMT