dselcan/rf-room-sensor-hwPCB design files and BOM for the RF Room Sensor device
Rf room sensor is an open-source printed circuit board by dselcan, from the dselcan/rf-room-sensor-hw repository on GitHub, published under the BSD-3-Clause licence. It is a 2-layer board of 50.8 × 44 mm with 32 parts on 31 nets, routed with 349 tracks and 47 vias.
It is built around the ATTINY404-SSN, PCA9306DC and TLV73333PDBV, with the BSS84 among its other parts. Its parts include 10 capacitors, 10 resistors, 5 ICs, 3 connectors and 1 transistor. It belongs with the radio and wireless and sensors and measurement boards and the AVR (ATmega, ATtiny) boards of this library.
The RF Room Sensor device is a remote monitoring device, capable of measuring the local temperature and hummidity at the location where it is placed. It is designed to be powered by 3 AAA rechargable cells, with an expected charge lifetime of 5 years. The data is sent over the 433 MHz ISM band as a Manchester-modulated OOK signal and collected by a central node, featuring a 433 MHz receiver. The data is then stored in a database and exposed to the user over a local website.
The primary design constraints are a 5 year lifetime and a form factor comptabile with the Hammond Manufacturing 1551V3WH enclosure - thus, the final size of the device is 60 mm x 60 mm x 20 mm. The sensor used is the TI HDC1080, offering a ±0.2°C temperature measurement accuracy and a ±2% relative hummiditiy measurement accuracy. The device is controlled by an ATtiny404 microcontroller, which features a sufficient low power mode to achieve the expected 5 year charge lifetime. The RF data transmission interval is approximately 20 seconds, where an external 433 MHz transmitter is used as the transmitting module - when not in use, it is powered off by using a P-type MOSFET. The battery holder is constructed using naked battery tabs and the PCB, which is then screwed into the enclosure - no additional battery holders are envisioned, due to form factor limitations of the enclosure.
Additionally, a air quality monitor is envisioned to also be supported - however, at the time when the project was designed, no sufficiently low power air quaility monitors existed and as such, it was never populated. The air quality part of the circuit (right side of the schematic) is as such not tested and not included in the BOM.
Manufacture the PCBs according to the provided project. The BOM is present in the associated BOM.csv file. Solder all the components to the PCB - ignore the remaining components on the PCB that are required for the air quality monitor. Before solderign the 433 MHz transmitter, do a fit check to the enclosure - if required, the header on the 433 MHz transmitter can be desoldered to gain the extra space. Solder the 433 MHz transmitter to the RF header using approximately 5 cm long thin wires - Pad 0 is GND, Pad 1 is the data pin and Pad 2 is the VCC supply pin. Wrap the transmitter in a non-conductive tape to prevent short circuits with the battery pads. Carefully place the batteries into the holders - beware the polarity, no reverse polarity protection is present. Immediately screw the PCB into the bottom half of the enclosure - this will fix the batteries into place.
The whole RF Room Sensor project is licensed under a BSD license.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 10k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2, R3, R4, R6, R7, R8, R9, R10 |
| 6 | 100n | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C3, C4, C6, C7, C8 |
| 3 | 1u | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C2, C5, C9 |
| 3 | Battery_Cell | air_quality_sensor:BatteryHolder_Keystone_56_AAA | BT1, BT2, BT3 |
| 2 | 200k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R5 |
| 1 | 1n | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C10 |
| 1 | ATtiny404-SS | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U2 |
| 1 | BSS84 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | CCS811 | Package_LGA:AMS_LGA-10-1EP_2.7x4mm_P0.6mm | U5 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | Conn_02x03_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J3 |
| 1 | HDC1080 | Package_SON:Texas_PWSON-N6 | U1 |
| 1 | PCA9306DC | Package_SO:VSSOP-8_2.3x2mm_P0.5mm | U3 |
| 1 | TLV73333PDBV | Package_TO_SOT_SMD:SOT-23-5 | U4 |
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With the Arduion programmer board loaded with the jtag2updi software, and the Pin 6 from the Arduino connected to the Reset line on the ATTiny404, you can Build and Program directly inside of the Visual Studio Code.
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See our final report for a technical overview of the demo we presented.
It measures 50.8 × 44 mm and has 2 copper layers, 1.6 mm thick.
32 parts, built around the ATTINY404-SSN, PCA9306DC, TLV73333PDBV and BSS84. 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.
From the dselcan/rf-room-sensor-hw repository on GitHub, at the commit this page was made from: the board is rf-room-sensor.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Its repository publishes it under the BSD-3-Clause licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).