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by kevinbr
Fri Jul 05, 2019 4:03 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 895
Views: 104935

Re: Raspberry Pi 4 Thread - general discussion

6) What doc has 8GB? Range is 1,2, or 4GB I think is was a linked pi3g doc not RPF's doc, they seemed to have some more insider detail, how accurate? Nice to know I have 2 years to learn the Pi 4 before you give us new versions :lol: That might not be enough time :oops: . Maybe you are confusing it...
by kevinbr
Fri Jul 05, 2019 1:06 pm
Forum: Off topic discussion
Topic: Solid-state-relay losses
Replies: 16
Views: 2634

Re: Solid-state-relay losses

it also states A GPIO pin should never be connected to a voltage source greater than 3.3V or less than 0V which is what we have been telling you. You cant just pick the specification you would prefer, you have to make sure you meet all specifications. Well its been working fine for a few years now.
by kevinbr
Fri Jul 05, 2019 11:37 am
Forum: Off topic discussion
Topic: Solid-state-relay losses
Replies: 16
Views: 2634

Re: Solid-state-relay losses

I had this problem so I wired the SSR between 5V and the GPIO pin. When the GPIO pin is low the SSR gets 5V. But when the GPIO is high, a current flows between 5V and the 3.3V on the GPIO, thereby forcing current into the GPIO. Normally this would be bad for the chip, but with the voltage drop in t...
by kevinbr
Thu Jul 04, 2019 4:03 pm
Forum: Off topic discussion
Topic: Solid-state-relay losses
Replies: 16
Views: 2634

Re: Solid-state-relay losses

I had this problem so I wired the SSR between 5V and the GPIO pin. When the GPIO pin is low the SSR gets 5V. But when the GPIO is high, a current flows between 5V and the 3.3V on the GPIO, thereby forcing current into the GPIO. Normally this would be bad for the chip, but with the voltage drop in th...
by kevinbr
Thu Jul 04, 2019 12:39 pm
Forum: Off topic discussion
Topic: Add Analog to Digital pins to the pi
Replies: 21
Views: 4904

Re: Add Analog to Digital pins to the pi

You can read slowly changing analogue values (light, temperature etc) using one digital pin and a capacitor.

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