- #31
Need help with MOSFETs and photoresistors
- Thread starter hugo_faurand
- Start date
Click For Summary
Discussion Overview
The discussion revolves around the construction of a light-steered robot using photoresistors and MOSFETs. Participants explore the functionality of MOSFETs as switches in the circuit, the correct schematic representation, and the challenges faced in assembling the components on a breadboard.
Discussion Character
- Technical explanation
- Conceptual clarification
- Debate/contested
- Homework-related
Main Points Raised
- One participant describes the intended function of the robot, where photoresistors control motors based on light detection.
- Another participant explains that MOSFETs act as switches and questions the current flow through reverse-biased photodiodes.
- Concerns are raised about the schematic, specifically regarding the type of MOSFETs used and their correct orientation.
- Participants discuss the need for clarity on the components, including verifying whether photoresistors or photodiodes are being used.
- One participant expresses difficulty in understanding how to use MOSFETs and requests simpler documentation.
- Another participant provides a tutorial link and emphasizes the importance of understanding the MOSFET pin configuration and operation.
- Clarifications are made regarding the operation of enhancement mode MOSFETs and the relationship between the gate, source, and drain.
- Participants discuss the importance of resistor values and their role in the circuit.
- One participant shares a link to a schematic and asks for feedback on their understanding of the connections.
- Another participant mentions testing the circuit but reports that it does not function as expected, raising questions about resistor values and circuit design.
Areas of Agreement / Disagreement
There is no consensus on the correct schematic representation of the MOSFETs, and multiple viewpoints exist regarding their configuration and functionality. Participants express varying levels of understanding and clarity about the components and their connections.
Contextual Notes
Participants note potential confusion regarding the type of MOSFETs (N-channel vs. P-channel) and the correct orientation in the schematic. There are also unresolved questions about the specific resistor values needed for the circuit.
Who May Find This Useful
This discussion may be useful for students or hobbyists working on similar robotics projects involving light sensors and MOSFETs, as well as those seeking to understand the practical application of these components in circuit design.
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