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Ahtisham Ashraf
Ahtisham Ashraf
5:34 AM
https://www.amazon.com/uxcell-Electromagnetic-Solenoid-Assembly-Electirc/dp/B07TKR7KLH/ref=pd_sbs_1?pd_rd_w=kXz1p&pf_rd_p=2419a049-62bf-452e-b0d0-ca5b7e35a7b4&pf_rd_r=Q3YR6S59GBCEH8JF9T41&pd_rd_r=9360687c-a89d-4784-8f52-3a08a2877191&pd_rd_wg=ox9Cq&pd_rd_i=B07TKR7KLH&psc=1
This is the one i ordered. @tlfong01
 
 
1 hour later…
tlfong01
tlfong01
6:50 AM
@AhtishamAshraf Ah, you solenoid door lock looks nice, and I have appended your link to my reference list. Question: Did you have a choice of 6V or 12V? And you prefer 6V? I am asking because your magnetic lock is 12V, so we might not be easy to compare and contrast the back their corresponding back EMF and EMI. Anyway, this is not a problems at all, perhaps this way we might find that 6V is better than 12V! :)
 
 
4 hours later…
Ahtisham Ashraf
Ahtisham Ashraf
11:02 AM
I am using 12 V because it is universal and i am still debugging about the back emf or coding issue @tlfong01
 
 
1 hour later…
tlfong01
tlfong01
12:12 PM
@AhtishamAshraf Yes, I very much agree with you that 12V is universal. It is industrial standard for hundreds of years, even before 5V TTL. Of course I have been using 6V for most of my Arduino and Rpi years, because I have been doing Mickey Mouse toy projects. One thing I always remember is that 12V has less noise than 5V, and 5V is less noisy that 3V3.
 
tlfong01
tlfong01
12:30 PM
@AhtishamAshraf I am also reading my and others' old posts on using MFRC522, to refresh my memory. I will be adding those post links later to the reference list. One important thing I still remember is as I said earlier, about the package/library called SPI-py. Do you remember if you did install this SPI-pi when using MFRC522 programs. I always suspect it is this library that causes all the trouble, but I am only 80% sure. Anyway, you can search MFRC522 or RC522 in this forum for more info.
 
tlfong01
tlfong01
12:58 PM
@AhtishamAshraf I might be buying this 12V/24V lock (TaoBao price only CNY10) to compare your 6V version. I am 50% sure of the following: (1) 12V lock draw less current, (2) Energy stored in a solenoid is proportional the the square of current, (3) Therefore 12V lock, compared to 6V version, when current is switched off has less back EMF.
 

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