Espruino JavaScript
Lilygo TTGO T-Watch-2020 #6873
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Posted at 2020-05-18 by @gfwilliams Wow, I hadn't. Looks really interesting! It's the kind of thing you probably could port Espruino to, and then could maybe even run the existing Bangle.js apps on it. Posted at 2020-05-18 by @fanoush well esp32 is not very power efficient when compared to nrf52, see e.g. Posted at 2020-05-18 by kri100s Design is really nice. Similarities to apple watch. Not so many sensors. It would be nice to run espruino on it. I thought esp32 espruino build doesnt support the Bluetooth yet? Posted at 2020-06-14 by DrAzzy It looks like some functions are available - but it doesn't look like things were ever fully implemented - or if they were, they were not documented... http://www.espruino.com/Reference#ESP32 Posted at 2020-10-07 by jeffmer I have been creating an Espruino environment for the T-watch. You can see the results in the video below: AppsBangle Apps can be ported fairly easily. The reprogramming required is to adapt the Bangle button controls to the touch screen. You can see my Multiclock app and @fredericrous 's excellent calculator in the video. Battery lifeThis was the biggest headache. I implemented access to the ESP32's light sleep, however, initially, the current consumption during sleep was 20ma. I nearly gave up at that point but eventually discovered that the ESP32 Espruino port initialises all GPIO pins with pullups. When I removed this initialisation, the sleep current dropped to 4ma. The T-watch has an AXP202 power management chip and by reducing the CPU supply voltage to 2.7V, the sleep current is now 2.5ma. The battery is nominally 380mah and probably more realistically around 300mah giving around 5 days standby power - not amazing compared to the Bangle but at least useable. The active power consumption is around 90ma - again not great when compared to the Bangle, however the screen is brighter even at 30% of maximum brightness. To get to 90ma, I have removed the BLUETOOTH component which consumes around 40ma. GraphicsThe T-watch has a 240*240 1.54ins screen driven by an ST7789V driver - the same chip as the Bangle, however the interface is SPI not 8-bit parallel. Thanks to @MaBecker ‘s The T-watch has very few peripherals compared with the Bangle - speaker, vibration motor, infra-red receiver and accelerometer with in-built step counter (ASIC). It does however have wifi which I plan to look at next. The software is all on Github here but completely undocumented at the moment. Posted at 2020-10-08 by @gfwilliams Wow, this looks impressive! Nice thing about ESP32 is WiFi should be trivial - you could even make it load apps off the BangleApps site directly. I'd been looking at the buttons/touch situation for a Bangle.js v2 and I figured you could just emulate BTN1/2/3 using the right-hand side of the touchscreen - not sure if that helps?
@MaBecker after your work on the Posted at 2020-10-08 by jeffmer Thanks for the kind words. Loading apps direct from Github is a great idea. I am not sure about button emulations - there are a lot more possibilities on a touch screen swipe up/down as well as left/right,long-touch and double touch. It might be less intrusive visually to map BTN’s to some if these. In addition, for some apps - for example the calculator - it is more natural to use the full facilities of touch. With reference to your post on a unified interface , I think it would be equally important to manage variants of the same app for different targets in a general purpose Espruino App loader. Posted at 2020-10-09 by @gfwilliams Yes, it's more for the simple apps - obviously there are some that would really benefit from being rewritten to handle touch properly. Interesting thought about having different versions of the same app - I'd started adding some feature checking, so you could say 'this app needs a touchscreen' . I hadn't really considered that you might have two versions of the same app meant for different devices, but hopefully that wouldn't be too hard to handle. Posted at 2020-10-11 by DrAzzy From what I've heard though, the battery life was still pretty dismal on these? There are some things Espressif is very good at, but power saving isn't one of them... Posted at 2020-10-11 by jeffmer The ESP32 power saving design is fine, its the board designers that let it down. For example, the light sleep current of the ESP32 itself is 20-40 microamps, however, the T-watch only manages to reduce to 2.5ma. The active current can be reduced by introducing sleep in the idle loops, but this is not currently supported in the Espruino port. However, turning on the Wifi drains the battery fairly quickly! Using it simply as a watch with on time between 5 and 30 seconds, I get about three days battery life which is OK. Posted at 2020-10-11 by jeffmer I had a go at porting the App Manager from the Bangle and managed to run it unchanged by implementing a version of I think the buttons are better at the bottom of the screen as otherwise your fingers obscure a lot of the screen when you use them. The implementation uses a 2-bit Posted at 2020-10-11 by @MaBecker Nice, I really like it. Posted at 2020-10-11 by @fanoush
Also turning on Bluetooth Low Energy drains the battery fairly quickly. However one guy managed more than one day with BLE 'on' by runing BLE advertising every second (yes 1 packet sent each second) Then the horrible power drain with BLE turned on averaged into something reasonable. Posted at 2020-10-12 by jeffmer Yes, I have made now made the repository public -jeffmer/Twatch_Espruino. My changes to the Espruino firmware are at jeffmer/Espruino. I noticed that current partitions for the ESP32 allocate only 256K to Storage. In addition, the configuration is for 4Mb of flash. The T-watch has 16Mb of flash - I would grateful for any guidance as to how to build a version of Espruino with different partitions? Posted at 2020-10-12 by jeffmer I completely agree that the ESP32 Bluetooth consumes a lot of power. I noted above that it seemed to require 40ma even if not active and so I removed it completely. This post espressif/esp-idf#947 (comment) would seem to indicate that Bluetooth on current ESP32 hardware is a lost cause as you need an external 32.768Khz crystal to get effective low-power performance (yes, it uses 1 second advertising!). Overall, I think the T-watch is great as it has a large bright touchscreen but it would be of much more practical use as a smartwatch if it was based on low-power Bluetooth SoC such as an NRF52840. (I have a P8 - NRF52832 - on order! ) Posted at 2020-10-12 by @fanoush
Great watch for the price. This weekend I got SPI flash storage working together with the display (it has shared SPI pins between spi flash and display so was a bit tricky) so code runs from SPI like on Bangle, @enaon does great things with P8 and is always out of space so he nudged me to get it working. Posted at 2020-10-12 by @MaBecker Great - thanks for sharing
Posted at 2023-10-02 by ccchan you people are good at the tech spec, it is NOT water proof! Posted at 2024-02-25 by user157577 In a case that there is other newcomers like me trying to improve power consumption, this is probably obvious, but with my 2020 v3 putting touchpanel and tft driver ic:s also to sleep when not needed improved the battery life a lot. The Arduino libraries have built in functions for that. At the moment 2.5 days of sleep consumed only 25% of battery. |
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Posted at 2020-05-18 by opichals
Hey!
Heard of this one?
https://www.cnx-software.com/2020/05/17/lilygo-ttgo-t-watch-2020-is-a-nicer-looking-arduino-programmable-esp32-watch/.
Best Regards
Standa
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