#5

To see anything on the market that’s comparable to a Teensy 3.2 at a 1/4 the price is super exciting. I’m sure the support/documentation is going to be really thorough but it’d be hard to Paul Stoffregen’s level of support!

2 Likes
#6

At work, so not much time to respond but: it’s not quite near Teensy 3.2 levels of oomph or features, especially when it comes to ADC and DAC. It’s a very bare bones dev board indeed, but the chip is really interesting. And it looks like the chip will eventually be available bare.

All the data sheets they have released are excellent.

I’ll try to bang out something longer at some point.

5 Likes
#7

It’s nice to see more small footprint microcontrollers enter the market. It is a bummer there’s no onboard DAC. I found this chart comparing the Pico and Teensy LC helpful.

Raspberry Pi Pico vs Teensy LC

7 Likes
#8

Beats the pants off the Teensy. I wonder if it has JTAG programming and SWD…

1 Like
#9

If like to see a feature comparison to the $6 adafruit QtPy (which has way fewer pins, but yeah)

2 Likes
#10

Qt Py is a single-core Cortex M0+ - 48 MHz 32 bit processor with 256KB Flash and 32 KB RAM, and only 11 GPIO pins. It’s much less of an offering by nearly all metrics.

#11

aughhh please can we abolish usb-mini micro-usb jacks.

(edit: typing in a fury lol)

9 Likes
#12

It may come down to ease of use via library support - which is very strong in teensy/adafruit land.

Micro?

But use what instead? Usb-C?

#13

It runs micropython, which seems to be the direction the “ease of use” crowd is going for embedded devices. And of course it’s a standard M0+ with ARM multicore support, so that’s fine for the rest of us.

1 Like
#14

It has SWD on the three pins at the end.

It doesn’t, to my mind, beat the pants off a Teensy 3.2 (it is much more of a pants-beater for an LC); it punches a strong numbers game, but there’s some funkiness such as:

  • the Pico itself has a 3 pins capable of 12-bit ADC. Except: there’s no precision voltage source for the ADC reference. You need to supply your own, which is fine (but not a move most people used to these boards will be used to), or do some futziness with trying to deripple the main power supply. Fine, but not as usable out of the box.
  • no EEPROM whatsoever. That bigass SPI ram chip is mainly to support the size of MicroPython code. (See also the way the Adafruit boards use SPI ram for precisely that reason). This is a small thing, but I always find myself using NV ram in some way or other, and I forget if Micropython gives you access to that NV ram when it’s already being used for the python code.

But it is very cheap for what it is, and lots of the stuff that’s missing from that board that appears on, say, a Feather M0, helps bring that cost down. Rip off anything remotely unnecessary and you can hit that price point.

Easily the most interesting thing there is the RP2040 itself. The 636-page datasheet for that is already out, and the guide to designing boards around it makes it pretty clear that the chip will be available on its own.

(Also: the explanation for the chip name in the datasheets makes it clear this the first Arm MCU from RP, not the only one.)

2 Likes
#15

Arduino already has a board in the works based on this rpi-pico chip

#16

My statement was in direct response to the graph posted above, so yes, I was referring to the LC. I never mentioned a 3.2.

#17

I would absolutely love to see USB-C replace all the other small USB variants on dev boards, because it’s so vastly superior and I can’t imagine it adding more than 50¢-$1 to the price. I’d also love to see voltage output pins so the same USB-C cable could be used to carry higher voltage for components that is bucked down to 3.3V or 5V for the board itself…

#18

I don’t think there’s a USB-C compatible PHY embedded in the M0+ core peripherals. They’d have to include an external PHY (which would complicate the USB implementation and drive up costs) or design from scratch a compatible peripheral, neither of which is cheap or easy.

#19

Incase anyone missed it they are already using the PIO ports + a resistor ladder as a DAC for VGA signals. If the PIO clocks fast enough then high frequency DDS ( direct digital synthesis ) with a few external components (RC filter) should work extremely well.

#20

Bitbanged DVI on the RP2040 Microcontroller:

Also - adafruit is doing a Feather form factor version with this chip (and ItsyBitsy as well)

Adafruit version has USB Type C connector

3 Likes
#21

you can use USB-C jacks without a PHY just by providing two pullup resistors, it’s pretty great!

1 Like
#22

I’m not sure that’s “legal” according to the USB specs. IIRC, a major vendor can’t offer it like that. The USB-C jack is only permitted according to USB 3.0 and higher standards. If you don’t support the additional signalling (to at least communicate that only USB 1.1 is supported, for instance) I don’t think you are within the spec.

#23

my understanding is that if the cc1/cc2 pins are set correctly for power delivery (ie, upstream) then the dn/dp pins exist pretty explicitly to support usb 2.0/1.1 — the market is already flooded with passive cable/jack converters so it seems the standard should have anticipated this. i guess i need to go read some more specs, though.

#24

Yeah, I’m the idiot who brought up the 3.2 and caused a cloud of confusion. @infovore is right, there’s a lot missing on the pico that the 3.2 has built in. The dual core is interesting but I’ve fooled about with the ESP32 and it’s a level of complexity that I haven’t quite gotten my head around even after a year+ of fooling with the ESP32. It’s still promising to see the price point and know that the development/support won’t be half baked.