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ASTABLE 555 - PHOTODIODE as a SWITCH | ASTABLE 555 - PHOTODIODE as a SWITCH | ||
After having learnt about the IC 741 aka the comparator circuit, it was our goal to utilize this in our second assignment. The other parts we were able to scavenge across the classroom. Two motors attached to the breadboard transformed our circuit into a little vehicle. | |||
The comparator circuit was controlled through a photo resistor. Depending on the amount of light hitting the photo resistor the state would be either high or low. A relay set up as an H-Bridge would transfer high and low two forward or backward movement of the motors. | |||
Originally we wanted to mirror this circuit on the breadboard so both motors could be controlled independently. Unfortunately we were missing a second Transistor (TIP-127) to be able to finalize our plans that weekend. | |||
Although not being able to complete our second assignment to the extend we had originally imagined, we somehow had the feeling our vehicle was developing it's own character in a way. | |||
e.g. it could be programmed to be shy of the dark, and stop driving when it leaves a well lit space. | |||
The jerkyness it had when changing directions, or it staying upright through it's low center of gravity somehow added to this impression. | |||
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[[File:Ass2_2.jpg|200px]] | [[File:Ass2_2.jpg|200px]] | ||
[[File:Ass2_1.jpg|200px]]<br> | [[File:Ass2_1.jpg|200px]]<br> | ||
COMPONENTS: | |||
1x | 1x | ||
Double Pole Double Throw - Relay | | Double Pole Double Throw - Relay | |
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