RE: Zener & LED Tester

DAB — Mon, 24 Apr 2017 18:32:43 GMT

Great post John.

You are become a very accomplished maker and your skills continue to climb.

I look forward to seeing you test some of your devices.

Should be a fun project.

DAB

RE: Zener & LED Tester

mcb1 — Mon, 24 Apr 2017 05:18:41 GMT

Well done.

You've mounted the three position switch upside down [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-8552978f-e0ba-4cf6-aff1-d0bdbc0b1f96/contentimage_5F00_1.png:16:16]

I'm busy putting my supply together based on your posts, and I'm pleased to see that my initial thoughts about the meter cutout was right.

(remove the electronics, fit the bezel in the hole, and then put the electronics back.)

The meters I brought were 0-100v at 10A,

https://www.banggood.com/Dual-Red-Blue-LED-Digital-Voltmeter-Ammeter-Panel-Volt-Gauge-Meter-p-918687.html

but I see this seller has a 1A version.

https://www.banggood.com/0_28-Inch-Dual-Display-Red-Blue-LED-Panel-4_5-30V-Digital-Voltmeter-Ammeter-1-100A-p-1093413.ht…

The kit is interesting as the 2SD1047 is capable of 140v at 12A, so the 3A limit is well down it's ability.

The board tracks will be the limiting factor, along with the control circuitry, but it is nice to know the output transistor is probably the last to go.

Fan control.

For anyone interested I did an Arduino sketch that allows for multiple DS18B20 sensors.

It takes the highest value and controls the output using that temperature.

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ontrol%28%29+%0A%7B%0A+++++++%2F%2FRelays+are+ON+when+the+output+pin+is+HIGH%0A%0A+++++++if+%28Highest+%3E%3D+HighTempOn%29++++++++++++++++++++++++++++++%2F%2Freading+is+above+or+equal+to+the+setting%0A+++++++%7B%0A+++++++++digitalWrite%28Relay1%2CHIGH%29%3B%0A+++++++++digitalWrite%28LedPin%2C+HIGH%29%3B%0A+++++++%7D%0A+++++++%0A+++++++if+%28Highest+%3C%3D+HighTempOff%29++++++++++++++++++++++++++++++%2F%2Freading+is+below+or+equal+to+the+setting%0A+++++++%7B%0A+++++++++digitalWrite%28Relay1%2CLOW%29%3B%0A+++++++++digitalWrite%28LedPin%2C+LOW%29%3B%0A+++++++%7D%0A%0A%7D]

Line 36 allows the maximum number of sensors to set (currently 5)

Line 50 and 51 determine the ON and OFF temperature

Mark