{"id":208,"date":"2017-01-15T22:23:05","date_gmt":"2017-01-15T16:53:05","guid":{"rendered":"http:\/\/madhurendra.com\/?p=208"},"modified":"2021-03-30T00:14:13","modified_gmt":"2021-03-29T18:44:13","slug":"cheap-ble-jdy-08","status":"publish","type":"post","link":"https:\/\/madhurendra.com\/cheap-ble-jdy-08\/","title":{"rendered":"Cheap BLE : JDY-08"},"content":{"rendered":"\n

Disclaimer : This post is based on my experience which is completely subjective, in no way I am promoting any application or product \ud83d\ude09<\/p>\n\n\n\n

I have been trying to get my hands into BLE4.0 modules since long. As always I was looking for small, cheap solution, JDY-08 was one of solution I came across – it seemed just Perfect !<\/p>\n\n\n\n

\"JDY-08\"<\/a>
JDY-08 Module<\/figcaption><\/figure><\/div>\n\n\n\n

It is based on TI-CC2541 SOC, Low power consumption – long range Voila!<\/p>\n\n\n\n

Below is what is being advertised by most vendors:<\/p>\n\n\n\n

  1. maximum transmit power of 0db, the maximum transmission distance of 80 meters.<\/li>
  2.  support serial allowing users to modify the device name through AT commands service UUID, transmit power, pairing password instructions, convenient to use and flexible.<\/li>
  3. Ultra-low standby power consumption 400uA ~ 800uA<\/li>
  4. Ultra-long connection distance 100 ft \/ 60 m<\/li>
  5. Fast reaction speed 0.4 secondsFor Apple, AndroidReceive no byte limit, up to 6K Bytes\/sec.<\/li><\/ol>\n\n\n\n

    I quickly ordered 10pcs without a second thought.<\/p>\n\n\n\n

    Below is what you should keep in mind:<\/p>\n\n\n\n

    1. Datasheet, documentation – everything is in Chinese! Cool !
      Luckily, Few folks did translation –       https:\/\/docs.google.com\/document\/d\/14mHWT3GhELCj-6yxsam0k5bjzazq8nnPoz4B_gYh04k<\/a>
      Also, you can check       http:\/\/forum.arduino.cc\/index.php?topic=432074.0<\/a> because this is the only helpful resource in the web.<\/li>
    2. Firmware is broken – at least for me, some other user confirmed same in above Arduino thread.<\/li>
    3. No other support.<\/li>
    4. Non-standard board pitch, you cannot use header pins<\/li><\/ol>\n\n\n\n

      But it is good in many ways:<\/p>\n\n\n\n

      1. Small size, thin, light, small – cool!<\/li>
      2. If you use HC-05 or HC-06 for transparent communication, you can use GATT terminal for transparent communication.<\/li>
      3. Very low power consumption – from my tests, I found 0.5ma consumption.<\/li>
      4. Long range – upto 30meters without optimization.<\/li>
      5. iBeacon mode – works fine – but power consumption was 0.5ma<\/li><\/ol>\n\n\n\n

        I was unable to test as I could only use GATT write & notify methods, AT commands to change mode & device name, even AT+RST returned ERR.<\/p>\n\n\n\n

        You can use following tools to test :<\/p>\n\n\n\n