Espruino JavaScript
Pixl.js v2 requests? #4331
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Posted at 2021-01-07 by @yerpj In addition to USB (serial, right?) and the possibly to add a WiFi module, I would love to have
That's all I think about now. Posted at 2021-01-08 by ConorONeill This sounds amazing Gordon. Love everything in your list. Agree that Aruduio header should be left off by default but would like the ability to add header pins. On the Pi front, one thing to watch out for is the orientation of the connector on the Pi 400. I've ended up using multiple adapters etc to get some screens and other devices pointing the "right" way around. Also agree with Jean-Philippe on the IMU. I'm using a Pixl at the moment with an external one to pick up movement. Works fine, just messy. On-Off switch for sure. But should totally turn off device even when connected to a charger (badge 2018 doesn't). Would an RTC be an over-stretch? I have one soldered to one of my 2018 badges and it's dead handy, particularly if you restart the device a lot. Are you thinking full USB on the nRF52840 or just charging? Any thoughts on USB-C connector vs micro USB? The latest Blackpill boards and some of the RISC-V boards have moved over. Lots of SPI Flash would be great. It's so handy on the Bangle.js One simple thing is that any buttons should be chunkier/meatier than the tiny ones of the 2018 badge or the tack switches of the 2017 badge. Just from a user experience perspective. Also games :-) Posted at 2021-01-08 by @gfwilliams Interesting - thanks! IMO: I'll look at this... Honestly I hadn't expected the Pixls to be moved around too much but Robotics is a good use case, especially with a motor driver on it. Touchscreen would be nice, but sadly I don't think those LCDs can come with one. Multiple connections: definitely - there's already an issue open to add that to the nRF52832, and technically it shouldn't be too hard. Interesting about servo headers... I can see if there's space, however it's so easy to push an Arduino servo board on I'm not sure it's worth making the PCB bigger just to add them if I can't find space. Mic: yes - I feel like easy voice recognition could be a 'killer' feature. It'd be so nice to have something that you can just wire up and say 'on' or 'off' to. secure memory: I'm not really sure there's much sensible I can do there. I could make it easy to turn on 'read-out' protection for the firmware in the chip, but I feel like providing something half-assed and calling it secure is worse than providing nothing :) Pi headers: Thanks... I was thinking at the very least making it compatible with Pimoroni's Breakout Garden boards (https://shop.pimoroni.com/?q=Breakout+Garden), but if I did pins 1-10 then it could also connect to the UART, so could be a plug and play terminal for the Pi. It'll need some thought to ensure it can be plugged into a Pi and is useful for those breakouts though. switch: I'm still in two minds about this - it should be low enough power consumption that it can do 'soft off' reasonably well. Not having a switch means the RTC will just keep running, which kind of solves your RTC issues. If I don't do that there should probably be a reset button though! (the new Pixl.js Multicolour boards have an on/off switch that works correctly ;) USB: Yes, definitely full USB (well, USB Serial for now) USB-C: Personally I'd probably stick with Micro USB as we can't use any of USB-C's features - as I understand it the USB-C connector is quite a lot more expensive and is harder to solder reliably. I think when we can do USB power delivery on the microcontroller it'd be amazing (being able to just ask for 12v power in code if you need it for a project) but until then I'm not sure it's such a big help. SPI Flash: yes - although the nRF52840 does have twice as much flash anyway, so likely 256kB or more will be available for flash storage (vs 40kB on most devices now). It might be something I have pads for but don't solder on - or maybe there's a 'pro' version. Buttons: yes - the new Pixl Multicolour has much better buttons (basically the Puck's buttons) and they come up level with the display. Posted at 2021-01-09 by AkosLukacs
Posted at 2021-01-10 by @allObjects
Posted at 2021-01-11 by @gfwilliams
It's a mix of price and power consumption... Memory LCDs would be lovely but are just too expensive (£20 or so for one of a decent size) and while I can get a 256x128 2 bit greyscale LCD in the same form factor, it uses about 10x the power :( It's tricky - I feel like Pixl.js is pretty unique in having a display and a really long battery life. I don't really want to ruin that for the sake of making the display just a bit better.
Arduino boards have a 3x2 'ICSP' connector on them that has the SPI pins on it. Some Arduino shields depend on those being there (the Ethernet shield IIRC?) so it'd be nice to have those to allow the shields to be plugged right in.
Thanks, that's a nice idea. At the very least I could add an outline for it and Grove
The plan is to use uSD at the moment - readily available and a lot easier to poke one in than to solder a chip ;)
I'm not quite sure what you mean here? A separate board for different LCD types? You could always stack an Arduino LCD display on the other side of it I guess? Touch would be nice and might give it a go and see if it works to put a capacitive touch sensor on the PCB behind the LCD. It didn't work great with NFC though, so I'm not sure how much hope I hold out. Posted at 2021-01-17 by AkosLukacs Looks like you can ask for any voltage using something like https://www.onsemi.com/products/interfaces/usb-type-c/fusb302 Posted at 2021-01-18 by @gfwilliams Nice - I hadn't seen those. I guess that could be an interesting option - I haven't heard of any dev boards with a configurable USB voltage on them. It'd need some thought though - I was planning on a LiPo charger but you'd have to maybe add another voltage regulator just for LiPo charging so you didn't blow up the charger when you turned up the voltage :) Posted at 2021-03-06 by AkosLukacs Somewhere you mentioned you already have some prototypes, but would adding a Feather footprint be possible? Posted at 2021-03-08 by @gfwilliams Do you have any ideas how I could fit a feather footprint into a Pixl.js style form factor though? For future Espruino-wifi shaped boards the feather footprint makes a hell of a lot of sense though Posted at 2021-03-09 by AkosLukacs Haven't checked before, just hoped one side of the arduino header would kind-of match a feather. But looks like no luck. A feather wing compatible-ish something might fit, if we ignore NFC, the coin battery and a routing signals, I guess :/ Posted at 2024-06-25 by GezaGH @gfwilliams, this was a very good idea..did anything happen to this? Posted at 2024-06-25 by @yerpj Looks like Jolt.js will partially address some missing features of Espruino's ecosystem like USB serial, Qwiic connectors,... Posted at 2024-06-25 by GezaGH @yerpj the Jolt.js would be a nice base for the Pixl.js V2. @gfwilliams: Proposal for the Pixl.js V2: A uFL socket should be used instead of ceramic or pcb antennas. Because the circuit, LCD, battery shields the chip antennas. Posted at 2024-06-26 by @gfwilliams Going forward I'm pretty sure I'll try and stick Qwiic connectors on new boards - it's reasonably easy to do and it does make adding extra sensors very straightforward. If it makes sense I'll look at a feather form factor for new boards as well (but for now I'm just seeing how Jolt.js does). The uFL socket is a tricky one - I know the aerial is shielded, I don't think an external aerial is what most users really want. To be honest the nRF52840 I'd likely use in a new device has 4dBm higher transmit power and a better radio for reception, plus the ability to do BLE long range, so it's likely to perform as well or better than an nRF52832 with an external aerial anyway |
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Posted at 2021-01-07 by @gfwilliams
Hi! Right now I'm running low on stock of Pixl.js, and rather than just making more of the same, I'm thinking now might be a good time to do a whole new design, maybe taking a few hints from Pixl.js Multicolour badge, which I've been using quite a lot myself recently.
So I'm thinking:
And possibly:
So the idea is to keep the super low power consumption of the original Pixl.js, but to put a bunch more features on it so it's far more usable as a standalone board.
Does anyone have any ideas for improvements, or likes/dislikes of the original Pixl.js that might be worth taking into account?
Thanks!
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