Questions tagged [fail-safe]

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3answers
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Intentionally tripping a fuse to disable a circuit in an unrecoverable fault condition?

I'm building a device that regulates the atmospheric composition of a space using a gas sensor and a control loop to actuate a solenoid valve to release compressed gas into the space. Due to the ...
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2answers
117 views

Is there such a thing as a fail-safe, low-power relay?

Background Let's say I have a device. I can't give details, but, like many heat-producing devices, it's intended to be used for a limited period of time, but if left on indefinitely can be very ...
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1answer
52 views

Turning a circuit off using a 240v signal

I have a home-built controller for a HERMS brewing system (Heat Exchanging Recirculating Mash System). The purpose of this controller is to drive liquid (wort) from a large mashing vessel (a cooler ...
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1answer
31 views

Use attiny as an external watchout timer

I like to failsafe an Atmega8 mcu despite having its own WDT. does it make sense that if I add an attiny to the circuit to check if each loop is taking a specific time, if not reset the Atmega chip?
1
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0answers
57 views

Manual overriding a DC-motor with H-bridge

I have created the following circuit where I use a VNH7070BASTR full bridge motor driver to control a DC-motor. The goal is to open and close a drawer using a rack and pinion system. A new requirement ...
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0answers
23 views

Failsafe solution to vertical router Z-axis assembly

Thank you for taking the time to read this. TL;DR: I need to somehow check the state of the motor and solenoid actuator. Only if the motor is ON and the actuator OFF should current pass into a relay (...
1
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2answers
49 views

Opening fail-safe electrical strike door with a spring

I have a 12V fail-safe electrical strike currently installed and working on a door, but I want it to open slightly when it is powered down, but a spring apparently won't do as my strikes keep themself ...
0
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1answer
52 views

Fail-safe joystick connection

I am looking for ideas to implement fail-safe function in joystick control box. At present, the 5V joystick HF11S10 is connected to STM32 ADC inputs via simple 5.1k:9.1k divider. We are revising the ...