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Parts
Humidifier Pad - HC26A
Fix - No Water Flow
Controller Images
Schematic
Here is the schematic that I put together based on some testing.
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- D2 is a zener diode which acts as a voltage regulator for the 555 chip.
555 Timer Reference Diagram
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Fixing the Solenoid
Since the solenoid was no longer activating, it seemed like a replacing it was in order. The replacement solenoid that I purchased was rated 24 VDC but didn't activate when connected. Perhaps the transistor Q1 does support the amount of current required by the new solenoid.
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I opted to bypass the 555 timer circuitry by connecting pin 4 of the internal connector (under cap) to ground. The 555 timer is not required.
New Parts
Part | Cost | Image |
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Baomain 1/4 Inch Brass Electric Solenoid Valve for Air Water Valve N/C (Normally Closed) DC 24V | $22.00 CAN | |
Generic Pneumatic Push in Quick Touch to Connect Fitting 1/4" OD Tube x 1/4" Male NPT 90 Deg Swivel Elbow Coupler. I would have bought straight ones but couldn't find them for a good price. | $13.00 CAN for 5 |
Finish Product
Here is a picture of the finished fix. Should be more maintainable now that these changes have been made. The new solenoid valve will allow a lot of water to pass so I have ball valve (not shown) limiting the flow to a trickle.
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