Best alternatives for Arduino Uno

Okay, it seems like there are lot of constraints. Rather than stand over you like a dentist pulling teeth, why don't you detail all of those in your next post?

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We have Module that design for Uno footprint and it need more than 3.3v to drive

Cost? The dental bill is rising.

Less than 3USD

Doesn't exist.

Not for $3, it doesn't. I have some of those. (ESP32)

ESP 32 is available but it is 3.3v

Yeah, not for $3. What is the actual problem with 3.3V?

We have one module which have LED matrix with 64 LED so it need more current I assume brightness will reduce drastically

Which module? What display IC does it use? I routinely drive LED displays on 3.3V. The ESP32 is a good value for the dollar, but it's still not $3.

It does not have Driver IC

< $3.00

Never going to happen !

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Try this simple test. Apply 3.3V to some of the LED module pins. I think you will be surprised at how little difference the supply voltage makes. In fairness, the drive current might stress the raw I/O pins of an ESP...

It looks like the module has no current limiting resistors. Horrors! Maybe they are under the display, but IDK. The importance of obeying specifications is an important part of electronics. Maybe your students should be exposed to that problem.

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If indeed it has no current limiting resistors, you should simply throw it away. :roll_eyes:

This whole project sounds like a complete planning disaster! :face_with_raised_eyebrow:

If cost was a concern, it would be more appropriate to base it on the WeMOS D1 Mini "shield" system which is quite comprehensive.

For example (it is a link):

(Just purchasing some now to play with - hadn't seen them before. :grin:)

Students are taught about current limiting resistor but we did not use it for cost cutting

So this project is a total fiasco then. :grimacing:

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