2 layers25.7 × 34.4 mm
D1 mini shield
UtilitechAS/amsreader-firmware
ESP8266 and ESP32 compatible firmware to read, interpret and publish data to MQTT from smart electrical meters, both DLMS and DSMR is supported
24 parts470
2 layers33.7 × 97.8 mm
HAN ESP TSS721
UtilitechAS/amsreader-firmware470ESP8266 and ESP32 compatible firmware to read, interpret and publish data to MQTT from smart electrical meters, both DLMS and DSMR is supported
- Size
- 33.7 × 97.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 29
- Nets
- 52
- Pads
- 119
- Tracks, vias
- 145, 16
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 12 Feb 2019
- Updated
- 5 Nov 2026
Overview
HAN ESP TSS721 is an open-source printed circuit board by UtilitechAS, from the UtilitechAS/amsreader-firmware repository on GitHub. It is a 2-layer board of 33.7 × 97.8 mm with 29 parts on 52 nets, routed with 145 tracks and 16 vias.
It is built around the ESP-12E, TSS721D and DS18B20, with the LM1117-3.3, BSS84 and RJ45 among its other parts. Its parts include 11 resistors, 6 capacitors, 4 ICs, 3 connectors and 2 switches. It belongs with the home automation and IoT and sensors and measurement boards and the ESP32 and ESP8266 boards of this library.
Main components
6
ESP-12E
SMD,24x16mm-20℃~+70℃ -90dBm 16dBm 170mA 2.4GHz 3V~3.6V 56mA 802.11b/g/n ESP8266 Chip On-board PCB Antenna Over-the-air (OTA) update UART、SPI、I2C SMD,24x16mm WiFi Modules ROHSAi-ThinkerWiFi ModulesTSS721D
-- Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
DS18B20
TO-92-55℃~+125℃ 12bit 3V~5.5V 750ms Single-bus ±0.4℃ TO-92 Temperature Sensors ROHSUMWTemperature Sensors
LM1117-3.3
SOT-2231 1.3V@(1000mA) 15V 1A 2mA 3.3V Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHShongjiachengUncategorised
BSS84
SOT-23-55℃~+150℃ 1 P-Channel 130mA 2.8pF 24.6pF 2V 3.2Ω@5V 300mW 4.7pF 50V 590pC@10V SOT-23 MOSFETs ROHSDiodes IncorporatedMOSFETs
RJ45
TH-12PTH-12P SMT ROHSJLCPCB AssemblyUncategorised
README
hardware/v1/kicad/README.mdElectrical Design
Explained
This design uses the Texas Instruments TS721 circuit for the M-bus to TTL conversion. From here, the 3.3V TTL signal is taken to the ESP-12 / ESP8266 for further processing and reporting over WiFi to MQTT. Really, this hardware is agnostic to what you choose to report to, the HAN library will help you decode the serial signal into readable meter values.
An addition to this design is using a DS18B20 as a temperature sensor. Just a little added value in monitoring the temperature of your fuse box.
There is an on-board programming option for the ESP. In order to do programming, my experience is that you'll be better off disconnecting the RX/TX from the TSS721, so there's two jumpers for this.
Other than this, it's all about software. You can find the Arduino code to decode the HAN data and report the values over WiFi to an MQTT server.
Schematics
PCB
Layers
| Top Copper | Bottom Copper | Silk | Combined |
|---|---|---|---|
 |  |  |  |
Source Code
The full KiCad source for these design files are here in this folder. Download this repository, start KiCad, chose open project and select HAN_ESP_TSS721.pro to get going.
Component list
| Name | Value | Part | Comments |
|---|---|---|---|
| C1 | 220uF / 16V | UVR1C221MED1TA | Electrolytic Capacitor |
| C2 | 100nF / 63V | R82EC3100AA70J | Metal Film Capasitor |
| C3 | 100nF / 63V | R82EC3100AA70J | Metal Film Capasitor |
| C4 | 220uF / 16V | UVR1C221MED1TA | Electrolytic Capacitor |
| C5 | 220uF / 16V | UVR1C221MED1TA | Electrolytic Capacitor |
| C6 | 100nF / 63V | R82EC3100AA70J | Metal Film Capasitor |
| R1 | 22k | CF14JT22K0 | 0.25W resistor |
| R2 | 470R | CF14JT470R | 0.25W resistor |
| R3 | 10k | CF14JT10K0 | 0.25W resistor |
| R4 | 10k | CF14JT10K0 | 0.25W resistor |
| R5 | 10k | CF14JT10K0 | 0.25W resistor |
| R6 | 10k | CF14JT10K0 | 0.25W resistor |
| R7 | 10k | CF14JT10K0 | 0.25W resistor |
| R8 | 220R | CF14JT220R | 0.25W resistor |
| R9 | 220R | CF14JT220R | 0.25W resistor |
| R10 | 22k | CF14JT22K0 | 0.25W resistor |
| R11 | 4k7 | CF14JT4K70 | 0.25W resistor |
| U1 | TSS721 | TSS721AD | M-bus tranciever |
| U2 | ESP12-E | ESP12 | ESP8266 SMT MODULE (Check e-bay for this one) |
| U3 | LM1117-3.3 | LD1117AS33TR | 3.3V Voltage regulator |
| U4 | DS18B20 | DS18B20 | Maxim Temp Sensor |
| Q1 | BSS84 | BSS84PH6433XTMA1 | P-FET transistor |
| J1 | RJ45 | 54601-908WPLF | RJ45 port |
| J2 | uUSB | 10118194-0001LF | USB micro socket |
| J3 | 6-pin female header | 4320-01074-0 | 6-pin female header |
| JP1 | XG8S-0241 | Jumper header | |
| JP2 | XG8S-0241 | Jumper header | |
| SW1 | Tactile Switch | 1825910-6 | Tactile Button |
| SW2 | Tactile Switch | 1825910-6 | Tactile Button |
| NONAME | STC02SYAN | Unless you have these lying in your drawer, you'll need two |
Complete shoppingcart, ready to order: http://www.digikey.no/short/jj1vhv
Parts
29| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 10k | Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R4, R5, R6, R7 |
| 3 | 100n | Capacitors_THT:C_Rect_L7.0mm_W3.5mm_P5.00mm | C2, C3, C6 |
| 3 | 220u | Capacitors_THT:CP_Radial_D10.0mm_P5.00mm | C1, C4, C5 |
| 2 | 220R | Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8, R9 |
| 2 | 22k | Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R10 |
| 1 | 470R | Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2 |
| 1 | 4k7 | Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R11 |
| 1 | BSS84 | TO_SOT_Packages_SMD:SOT-23 | Q1 |
| 1 | DS18B20 | TO_SOT_Packages_THT:TO-92_Inline_Wide | U4 |
| 1 | ESP Prog | Buttons_Switches_THT:SW_PUSH_6mm_h5mm | SW2 |
| 1 | ESP Reset | Buttons_Switches_THT:SW_PUSH_6mm_h5mm | SW1 |
| 1 | ESP-12E | ESP8266:ESP-12E_SMD | U2 |
| 1 | FTDI | Pin_Headers:Pin_Header_Straight_1x06_Pitch2.54mm | J3 |
| 1 | LM1117-3.3 | TO_SOT_Packages_SMD:SOT-223 | U3 |
| 1 | RJ45 | Connectors:RJ45_8 | J1 |
| 1 | RX | Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm | JP1 |
| 1 | TSS721 | Housings_SOIC:SOIC-16_3.9x9.9mm_Pitch1.27mm | U1 |
| 1 | TX | Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm | JP2 |
| 1 | USB | Connectors:USB_Micro-B | J2 |
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Questions
How big is the HAN ESP TSS721 PCB?
It measures 33.7 × 97.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the HAN ESP TSS721 use?
29 parts, built around the ESP-12E, TSS721D, DS18B20 and LM1117-3.3. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the HAN ESP TSS721 KiCad files?
From the UtilitechAS/amsreader-firmware repository on GitHub, at the commit this page was made from: the board is hardware/v1/kicad/HAN_ESP_TSS721.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the HAN ESP TSS721 design in my own project?
Its repository states no licence, so its author keeps all rights: ask UtilitechAS before reusing the design.