@terxw - sorry, the manual is wrong and unclear here - when you talk to the bluetooth module you should not connect to the programming pins. they are only for programming atmega chip. Must be a copy/paste error when i wrote the manual i think. Looking at the schematics RX goes only from that programming pin to the atmega and not bt module. TX has a input protection diode as well, so you need to swap that one to.

As you see in the image, RX and TX from that programming point is only connected to atmega chip. Try connecting them to ordinary input. In worst case scenario, the diodes are making the serial communication fail at the baud rate you are testing... (should work with 115200 since thats what i set it to) but worst case scenario, solder wires to BT module and test.

Also dont power it using BAT (it goes through a dc/dc booster if you do). Try a regulated 3.3v power source and input on 3.3v pin.

Also, change the both No line ending to Both NL and CR

Edit: I will be home on thursday, traveling at work, but I have a identical module i build the same time as yours I can test on, if you dont want to solder around and mess the module up.

@terxw - ok.
4800 should work just fine.
The command should be AT+BAUD3
I used this link when i designed and wrote this - it has some more in-depth analysis.
https://www.instructables.com/id/AT-command-mode-of-HC-05-Bluetooth-module/

What good to know is that if you are the one who bought the module from me just recently from ebay this is tested and verified working by me so we should get this sorted!!

Can you post a picture on how it looks (connections) when you try to change baud-rate?

@ferro - Hi no - the RFM version is 3.3v only. nrf24 data pins are 5v tolerant but the rfm radio isnt so thats why.

@dakipro woaw!!!

@terxw - sure! How do you connect when you wants to set up baud rate. (Picture?)
The module i send have 115200 set as for BT. If you have a node with that baud-rate - does it work? Or what does your node have at the moment for baudrate?

This is from https://www.openhardware.io/view/532/The-Logger-Machine-Short-and-long-term-serial-logging where i documented the instructions:

op

@yveaux @Daniel-RUIZ9 - but a POE injector should work? If you have an output on 5100 you should be able to use a POE injector in the other end (modem). This way you can plug the network cable to the modem and the power cabel to any voltage adapter (5v for example so you dont have the use a voltage regulator in the other end). On the 5100 you have to solder wires to those points you mention to extract the 5v.

Edit: as long as the POE injector send the power on the same lines as the 5100 has the output pins on - but I guess that should be standard!?

@bjacobse - thanks! Much to learn O will try your tips for sure.
Barbie/horses was a request from my daugher as well when i told her, hehe... not sure if its the first print but I guess i have to buy some PLA qiuckly.

@ab192 - I put that there because that is the limit of the HLK-PM01 output. I never use it though, (i just bridge it) and use the input-fuse... When you choose a fuse its much about what kind if load you are going to have on that circuit.

@bjacobse - oh! SORRY!! I missed your message! I appreciate your offer, really do - but this ended up in me buying myself a early x-mas present (Creality Ender 3). I will be able to print myself in a couple of weeks i hope.

3dhubs.com seems to be re-worked, and its not possible to select a local hub anymore. Price is about +100% for a small enclosure now.

Anyone knows any alternative? Local 3dprinting, 1-2 small prints for a good price.
Or anyone willing to print some small things in Sweden for some paypal money?