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Measure environmental data throughout the car, including humidity, airflow, and temperature (see data acquisition SRR for more rationale)
Physical: Make it as small as possible (need input from mechanical/E-mech)
Discuss form factor and mounting with Cooling
Talked to Kaden Nguyen 10/12/24
Airflow sensor needs to be exposed - preferably back of board
Humidity/temp can be anywhere
Make as small as possible around PSOM
Mounting holes on corners
Airflow only one direction - can have stuff on the other side of flow sensor
Does not need to be waterproof
Interface: this board will send all environment data to the main Environment Leader board Leaderboard via internal Data Acq. Environment CAN
Will then be sent over TelemetryCAN to the telemetry module??
Modularity: Pick Can pick and choose which sensors to use on each board during assembly – should not doesn’t require all sensors to be present
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Cooling: Nose Intake, Tail Exhaust, Battery box intake/exhaust, internally in battery box multiple locations
any other systems needing environmental sensing TBD
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Connection List
# |
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Name |
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Type |
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Ideal Voltage | Notes | |||
|---|---|---|---|---|
U4 | Daughterboard Connector | 53307-2471 (PSOM) | N/A | 3.65mm tall |
J2 | CAN Output | 1x4xP3.00mm_PolarizingPeg_Vertical | +12V | 6.98mm tall |
J3 | CAN Input | 1x4xP3.00mm_PolarizingPeg_Vertical | +12V | 6.98mm tall |
Daughterboard Connection List
Pin # | Net Name | Notes |
|---|---|---|
2, 9 | +3.3V | General 3.3V source for SHT45 humidity sensor and FS3000 airflow sensor |
4, 11 | GND | Ground associated with general 3.3V source |
6 | I2C2_SDA | I2C data signal for FS3000 airflow sensor |
8 | I2C2_SCL | I2C clock signal for FS3000 airflow sensor |
10 | VDDA (3.3V) | Isolated 3.3V analog voltage source for LMT87 temperature sensor |
12 | GNDA | Isolated analog ground for LMT87 temperature sensor |
14 | I2C1_SCL | I2C clock signal for SHT45 humidity sensor |
16 | I2C1_SDA | I2C data signal for SHT45 humidity sensor |
20 | PA1 (ADC) | STM32 analog-to-digital converter input on PSOM; connected to analog output of LMT87 temperature sensor |
21 | CAN_L | CAN Bus Low; connected to other Environment boards and Leader board over EnvironmentCAN |
22 | +12V_In | 12V input from CAN I/O connector |
23 | CAN_H | CAN Bus High; connected to other Environment boards and Leader board over EnvironmentCAN |
24 | GNDPWR | Ground associated with 12V from CAN I/O connector |
| Note |
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I2C2 jumpers on Peripheral SOM must be closed for pull-up functionality (default is open for GPIO) |
Main (WIP)
Schematic
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| Note |
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R1 and C6 values chosen arbitrarily due to lack of documentation, need to test/verify |
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