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Forum Index : Microcontroller and PC projects : PicoMite MMBasic GPIO Library v1.0 available

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phil99

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Joined: 11/02/2018
Location: Australia
Posts: 2579
Posted: 12:54am 10 May 2025
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  Quote  I wish they would make a dip40 or dip68 (like the 68000) package... (with ALL the gpio's brought out and ditch the on-board noisy regulator. only USB-C , reset and boot button and flash/psram on the qspi). i may have to roll one.... the current boards are wider than a standard DIP40
Not quite what you want but...
They have the same footprint as a standard Pico RP2040 but these have all the GPIO pins, a linear reg, USB-C and 16MB flash. Select the Purple 16M one.
There are many other sellers with this module so it is worth shopping around.
One with a better view of the pins Scroll down to the description.
Edited 2025-05-10 11:05 by phil99
 
vincenthimpe
Regular Member

Joined: 14/10/2018
Location: United States
Posts: 71
Posted: 04:24am 10 May 2025
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More something like this : Fits a standard DIP40 socket without overhanging.
 
PhenixRising
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Joined: 07/11/2023
Location: United Kingdom
Posts: 1331
Posted: 03:39pm 23 Jun 2025
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Does this mean that we can drive an LED without a current-limit resistor?

  Quote  - control the drive strength of a pin
 
Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 7819
Posted: 04:13pm 23 Jun 2025
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No. It means that you have a safety device to help limit maximum dissipation of the chip. If you drive a pin into current limit the dissipated power has to go somewhere - heat. You shouldn't ever rely on it for anything else.

Also, the "noisy reg" can be a necessity. It's better to design the rest of your system so that it can be used. It dissipates far less heat than a linear. It will let you run a Pico from a 3V7 lithium cell with no issues (the cell protection will cut in before the Pico stops working). That's not possible even using a LDO reg.
3V3 wanted. Dropout voltage 200mV at best. Vfwd of a Schottky diode to isolate from VBUS is about 300mV at best so you need 3.3+0.2+0.3 = 3V8 absolute minimum from the battery.
.
Edited 2025-06-24 02:22 by Mixtel90
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
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