I just soldered a 1N4007 across the output terminals! (See the red arrow!) No particular reason for picking the 1N4007 – just because that was what I had at hand.
#ARDUINO CAR BATTERY MONITOR GENERATOR#
It is a scary moment when you have cut the wires at exactly the right length and then have to remove the insulation! You know that if you fail and cut through the wire – it will NOT fit very well and you will have to extend the cut off wire in some not so very elegant way! The critical de-insulation – went well after all! 🙂 Just to calm my nerves I added a back-EMF diode! That is to protect the booster from the high voltage generated by the fan motor working as a generator when the fan spins down.
#ARDUINO CAR BATTERY MONITOR MANUAL#
(Albeit at the expense of higher current requirement.)Īt least for the moment what I have is a manual speed control that I can use to lower the fan noise a bit when the load – and the cooling capacity needed – is not so high! 👍 I have had plans to make the fan temperature controlled in Step 2 or controlled by the ESP8266 depending on the load – but this might turn out good enough … I will see!
That is really a good idea that I will have to remember in the future! Power something by 5V (or even 3.3V) and need a fan? Then use a 12V fan and a DC-DC Voltage Booster and get variable fan speed thrown in! So now all my 12V fans can be used at much lower voltages! That is really cool! Eh!? 😉
I had not planned to continue with the Ar2uino Dummy Load any more for the moment until Step 2 – but the day before yesterday when I replaced the normally(?) noisy fan of my Rigol 1054z oscilloscope with a more silent one (Gelid Silent 5) I suddenly had a fan of the right size left over! Not such a bad fan either but to noisy to listen to over extended periods with the oscilloscope! But that did not matter in this case – any fan would do for the dummy load! Just one critical thing wrong with it – it was a 12V version! The 5V fan that I sent for was $10 with shipping and even if I have gotten that money back now – I still have no fan! Then I realized that I could use this “left over” fan just by adding a DC-DC Voltage Booster to bring those 5V up to the stipulated 12V – for less than $1/€1/10SEK! No need to send for another 5V fan and pay $10 again! 🙂
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