Project Ownership: Ravi Shah
(feel free to format this page as you like Ravi)
schematic (WIP) Github Link: https://github.com/lhr-solar/DataAcq-EnvironmentBoard
Goal: BOM Link: WIP
Description/Purpose
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
Interface:
...
this board will send all environment data to the main Environment Leader board
...
via internal
...
Data Acq.
...
Humidity Sensor:
Environment CAN
Will then be sent over TelemetryCAN to the telemetry module??
Modularity: Pick and choose which sensors to use on each board during assembly – should not require all sensors to be present
Context
Location of the board: Several boards will be located throughout the car (specifically?)
List of I/O and connections: TODO
#, Name, Type, Ideal Voltage, Notes, etc.
Main
Schematic (WIP)
Basic sensor implementation as below
...
List of Circuit Components
Humidity Sensor – https://sensirion.com/products/catalog/SHT45
Description: Digital relative humidity and temperature sensor
Justification for selection of specific part: ??
Datasheet link: https://sensirion.com/media/documents/33FD6951/662A593A/HT_DS_Datasheet_SHT4x.pdf
Associated passives/components:
100nF capacitor
2x 10k resistors
Interface: I2C
Notes:
3.3v supply voltage
Maximal power-up time = 1ms
Also measures temperature – not using this functionality due to modular nature of board
Accurate to ±1.0 %RH
Airflow Sensor – FS3000
Description: Air velocity sensor module with 12-bit digital output
Justification for selection of specific part: ??
Datasheet link: https://www.mouser.com/datasheet/
...
...
...
Temperature Sensor:
Associated passives/components:
3x 0.1uF capacitors
1uF capacitor
Interface: I2C
Notes:
3.3v supply voltage
Temperature Sensor – https://www.ti.com/product/LMT87
Description: Analog temperature sensor with Class-AB output
Justification for selection of specific part: ??
Datasheet link: https://www.ti.com
...
Associated passives/components:
0.01uF capacitor connected between Pin 4 (VDD) and GND, other VDD pins connect to power plane
Interface:
Analog - output voltage inversely proportional to temperature as shown below
Notes:
2.7v to 5.5v supply voltage
0.7ms power-on time
CAN IC (WIP)
Need input on chip to use
Description:
Justification:
Datasheet link:
Associated passives/components:
Interface:
Notes:
12v to 3.3v step-down (WIP)
Need input on converter
Description:
Justification:
Datasheet link:
Associated passives/components:
Interface:
Notes:
Connectors (WIP)
PSOM
Power - Need input about power architecture
GND
Anything else needed??
EnvironmentCAN
TODO
Layout (WIP)
Dimensions:
Requirements/Constraints: TODO (From mech/emech/cooling)