Maddie’s research and notes on the accel and brake pedal sensors we’ll be using.
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2024-26 Selected
Factor | Spec |
---|---|
Mechanical Rating | Made of high quality ABS plastic and metal. Great durability, wear resistance, and strong connectivity. Each product is strictly inspected before leaving the factory to provide high-quality auto replacement parts. - Amazon |
Accuracy | IDK |
Type | TPS sensor, Flange Mount |
Output | Analog (ADC) |
Size | small |
Factor | Spec |
---|---|
Mechanical Rating | 1000 PSI 3/8-24 connection |
Accuracy | |
Type | 4-20mA Current Loop Transmitter |
Output | 4-20mA
|
Size | small |
Preliminary Notes (Author: Madeleine Lee )
Purpose of sensors
In the 2024-2026 car, Controls will need to detect the position of the accel pedal for movement, as well as the position of the brake pedal for fault conditions and telemetry. While the position of the acceleration pedal is necessary, the position of the brake is technically optional- all Controls needs is to enable the brake lights. However, for the purpose of analysis and additional features, we want to measure the position of the brake pedal and the pressure in the brake fluid line to
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and these sensors will be under Controls since we require it for the car state and therefore would like to receive this data as fast as possible (in short, we need it more/sooner than Data Aq).
What did we do in Daybreak?
In the 2022-2024 -2026 cycle, we used a linear potentiometer for the accelerator pedal, and a button for the brake pedal (since entering brake state is a binary decision).
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50mm Stroke (measuring length)
Cost: $144
SKU: SLPC 50 A 2K 1M (621400)
Compact linear displacement transducer with rod end bearings
2KΩ resistor value
18mm diameter (housing)
IP65 Rating
Connector: plug type w/mating connector included / Cable: 1 m length (3 wire)
Intended for industrial applications
Notes:
IP (Ingress Protection) Environmental Rating: Standard for the resistance of the part to environmental conditions like dust and moisture.
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Protection from liquids: 0 (none) - 9 (high-pressure hot water from different angles)
Why did we choose this sensor?
“linear was a relatively arbitrary choice made by me bc it was the first one I found with a good mechanical rating” - Sid
Sensor Research
Key Parameters
Mechanical Rating
Accuracy
Type (angular potentiometers, brake line pressure sensor)
Output (ideally supports digital protocol we use)
Cost (to some extent)
Size
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Name | Description | Type | Cost | Accuracy | Rating | Output | Size | Link |
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SLP Linear Potentiometer | Used on Daybreak | |||||||
HoneywellMLH | $288 | |||||||
PST-360 Hall-Effect Through-Shaft Rotary Position Sensor | Rotary Probably do not full 360 degrees, get as small as possible | $60 | +- 1 degree | IP67, IP69K | SPI (best), CAN, PWM | 14mm and 17mm versions | https://www.piher.net/products/rotary-position-sensors/through_shaft/pst-360/ |
References
https://www.reddit.com/r/FSAE/comments/ab3gs3/brake_pressure_sensors/
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