I have this Multimeter Owon B35T with Bluetooth 4.0. It has an Android app, but I want to transmit the Data to my Arduino or Raspberry Pi3, for Data logging. To do this, I had to analyse the Data coming from the Multimeter.
For receiving the Data from the Multimeter, I used a Bluetooth V4.0 HM-11 BLE Module connected to an Arduino pro micro running on 3,3V and 8Mhz. The module is connected to the serial interface of the Arduino and the received data are transmitted to the Usb port of the same Arduino connected to the PC.
The same way I configured the BT Module over At commands
2
Step 2
Config of the BT module.
I used a simple Arduino program to send and receive Data to and from the module.
First you have to set the module to Cental.
AT+ROLE1
moule = central
AT+RESET
reset
AT+SHOW1
show Bluetooth name in response
AT+IMME0
connect automatically
AT+FILT0
scan for devices
AT+DISC?
Show devices
To connect to the Owon B35T type AT+CONE0(Mac adress of the Multimeter)
Realterm lets you get various sorts of binary views of your data. Might be a useful tool. ( note that current development versions are at https://realterm.i2cchip.com ) There are a few BLE shortcuts on the MISC tab
Steve, Thanks for digging into this. It helped out a lot as I was also working on the serial protocol to get data logging into a linux machine. I figured out a few more fields. My code is up at https://github.com/cransom/b35t-reader if anyone wants to log to their raspi or other linux machine.
I 'm also having problems getting this to work, I printed out the entire data sheet from hm11 and several other docs. it appears that Jinan Huamao has blockes certian kinds of information transfer between devices.
hi Alain,thanks that would great. I think it's a real cool project and folllwing your main project. Thanks for taking the time to reply keep up the excellent wor
Hi I was wondering how did you get to read all the bytes into the Arduino ?
I've tried your serial program and only get garbage, I want to display the data on a 1.8" TFT screen, would it be possible for you to give me an idea of how you do it
I 'm also having problems getting this to work, I printed out the entire data sheet from hm11 and several other docs. it appears that Jinan Huamao has blockes certian kinds of information transfer between devices.
I have the same question as steve and have been at this for 30 plus hours. all is pointing to the uuid. Seems that the MAC address will not work.