DSMR Logger V4 (Smart Meter Reader)

Placed on 2019-04-16

Telegram received

The telegram is sent by the Smart Meter via pin 5 of the RJ12 connector with an inverted 5volt TTL logic. For the ESP8266, this signal must be inverted (back) as well as made suitable for 3v3 logic of the ESP8266.

Lever-Shifter/Inverter Circuit

At rest, R6 will be the Base of Q1 “high” pulling, leaving Q1 “Closed” becomes and the Collector, and with it Rx_SM “low" will be. If Tx_SM “low” is will the Base of Q1 also “low” will be and will be Q1 “Open" go stand. The Collector and with it Rx_SM will be pulled to 3v3 by R8. Rx_SM is then “high”. Does Tx_SM come with a “high” signal in, then the Base of Q1 will also “high" become. This causes Q1 to conduct and the Collector together with Rx_SM “low" become.

Lever-Shifter / Inverter on the 1of!-Proto board

Above you can see how that part of the schematic looks on it 1of!-Proto plate looks.

Previous page 2. data request circuit Current Page 3. Process telegram Next page 4. I2C interface 1. Introduction 2. data request circuit 3. Process telegram 4. I2C interface 5. ADC interface 6. Putting It All Together 7. A beautiful packaging Posted by Willem Aandewiel Website Willem Aandewiel (1955) has a background in electronics and digital techniques. However, most of his working life he has worked in automation where he has worked in just about all disciplines from programmer to project leader and project manager. Willem was one of the first Dutchmen with a micro-computer (KIM-1, 1976) at a time when the PC had yet to be invented. Nowadays he is mainly concerned with the design and production of small electronic circuits with microprocessors. His 'mission in life' is to make people enthusiastic about making their own electronic circuits, microcomputers and programming.

DSMR Logger V4 (Smart Meter Reader)

Telegram received

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