Label: DTU --- This WIFI DTU project, using ESP8266 module for hardware, developed on the nodemcu, is still the standard cost-effective development model with hardware and script. Thanks to Espressif Systems (Shanghai) Pte., Ltd. for its early product of cost-effective hardware. Thanks for the quick development model provided by the nodemcu team. Thanks for the DTU code provided by @瘦網蟲@vip6 provides. Code on github: [https://github.com/lewei50/DTU/tree/master/nodemcu][1] ## What can you do with this? With a 485-TTL device, all modbus RTU devices can be connected online. ![nodemcu+TTL轉485][2] For example, you can buy a power meter on TB for this project [DeviceBit Energy Monitoring Platform is Launched][3] ## References [DTU Tutorial 1: Overview][4] [DTU Tutorial 2: Using DTU to connect JSY-149 single-phase meter to DeviceBit][5] [DTU Tutorial 3: Using Python+Openwrt DIY DTU & Connect DeviceBit][6] [DTU Tutorial 4 DIY Low-cost DeviceBit GPRS DTU][7] [1]: https://github.com/lewei50/DTU/tree/master/nodemcu [2]: http://doc-resources.lewei50.com/lewei50/img/lewei50-20170604-3.jpg [3]: https://devicebitdevicebit.gitbooks.io/devicebit-power-meter-program/content/ [4]: http://www.hmoore.net/xjme/devicebitusermanual/395843 [5]: http://www.hmoore.net/xjme/devicebitusermanual/396861 [6]: http://www.hmoore.net/xjme/devicebitusermanual/397010 [7]: http://www.hmoore.net/xjme/devicebitusermanual/397907