written by: Fabian Suske

Approved and Edited by: Carolina Barrera

Intro:

In order to fulfill the L2-13 subsystem requirement “Safety/Temperature sensor” a test has been carried out. This test followed the Verification and Validation Test Plan. The temperature sensor was implemented as a safety switch in the device. The feature is to prevent incidents when the components overheat, and the device could potentially become a hazard for the user’s safety.

 

Test Objective:

The test criteria that needs to be tested in this inspection is the following:

 

“Test Objective:  To successfully verify the L2-13 (Safety) requirement, the Prosthetic Arm shall implement a temperature sensor such that upon reaching unsafe operating temperature (above 55°C), the system will shut-off “[1]

Test Method

The test was set up in the following way:

• Temperature sensor
• Maker1000
• C Algorithm to control the shutdown

Because of the incident while testing the kill switch, the Teensy MCU was not available for testing anymore. So, the temperature sensor was tested with the Arduino Maker1000 on a breadboard.

The breadboard was placed in a “temperature isolated” environment which was then heated up until the unsafe operating temperature of 55°C was reached. An indicator LED in the breadboard notified the system’s shutdown.

 

Test Conclusion:

Figure 1 shows that after the temperature reached the 55°C the Serial plotter stopped, and so we knew the shutdown had been initialized.

At the same time the LED indicating the shutdown went on in Figure 2.

The Serial Monitor also logged the temps and the shutdown. Figure 3 shows the analog serial values the temperature sensor was outputting.

[1] https://drive.google.com/drive/folders/0B3qlnfB-grPcVzJOTTZyemZ2R3c