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Sensor board

nEDM-TUM·Temperature-Sensor-System·circuit_boards/sensor_board/sensor_board.kicad_pcb

Sensor board layout, top view — open source AVR/Arduino board by nEDM-TUM

About the Sensor board

Sensor board is an open source AVR/Arduino PCB design by nEDM-TUM, published on GitHub. It is a 2-layer board measuring 65 × 137 mm, with 97 components from 35 distinct parts.

Its main chip is the ATMEGA88A-A, from the AVR/Arduino family. Other key parts include the LM7805 and ST485. By type, the board carries 34 resistors, 32 capacitors, 10 ICs, 10 connectors, 5 diodes and 3 switches.

It belongs with the sensors designs in this gallery.

From the project

System for reading/writing temperature sensors

Temperature-Sensor-System ==============

Sensor network system built for the nEDM experiment.

Features ------------------ - Both temperature and humidity sensors can be connected at any sensor socket. The sensor type will be automatically detected. - High temperature and humidity accuracy: Temperature sensors are calibrated to �0.1K and the humidity sensors to �1.8%rH. - A high number of connected sensors is supported. Currently 44 sensors are in use, however the system is designed to support at least 100 sensors and still be able to fulfill a sampling rate of 1Hz. If the sampling rate is…

Main components on the Sensor board

ATMEGA88A-ALM7805ST485

Sensor board bill of materials (BOM)

97 components, 35 distinct parts.

QtyPartRefs
1
ATMEGA88A-A
IC1
1
LM7805
U1
8
ST485
U2, U3, U4, U5, U6, U7, U8, U9
1
VAL**
m3_loch
1
20MHz
X1
1
RJ45_8P8C_8FACH
J1
1
UART
P1
1
Shield
P2
1
i2c_pow
P3
1
i2c_chain
P4
1
12Vin
P5
1
HOHLBUCHSE
P6
1
Vccin
P7
1
ISP
P8
1
5Vin
P9
1
pow_sel
K1
1
SW1
SW1
1
SCHALTER_2POL
SW2
1
SW_RESET
SW3
1
LED1
D1
Show 15 more
QtyPartRefs
1
LED2
D2
1
LED3
D3
1
LED4
D4
1
LED_POW
D5
3
10u
C1, C23, C24
25
100n
C2, C7, C8, C9, C10, C11, C12, C13 +17
2
22p
C3, C4
1
330nF
C5
1
100nF
C6
2
10k
R1, R9
5
150
R2, R3, R4, R5, R8
2
2k2
R6, R7
16
22k
R10, R11, R12, R13, R14, R15, R16, R17 +8
8
120
R18, R19, R20, R21, R30, R31, R32, R33
1
0
R34

Sensor board design files

The KiCad project lives in the nEDM-TUM/Temperature-Sensor-System repository on GitHub; these links point at the commit this page was built from.

Sensor board: common questions

What microcontroller does the Sensor board use?

The Sensor board is built around the ATMEGA88A-A, from the AVR/Arduino family.

How big is the Sensor board?

The Sensor board measures 65 × 137 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Sensor board?

97 components, from 35 distinct parts. The full bill of materials is listed on this page.

Where can I download the Sensor board design files?

From the nEDM-TUM/Temperature-Sensor-System repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Sensor board design in my own project?

The repository has no license, so all rights stay with nEDM-TUM. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Sensor board without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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