We’ve covered several ESP32 watches over the last year include TTGO T-Wristand, Watchy, and DSTIKE ESP32 watch. Those don’t really have the nicest looking design, and some people complained about various shortcomings including the difficulty to customize/program the watch.
Last year, Lilygo introduced TTGO T-Watch smartwatch that, due to support for expansion boards, was relatively thick, but at least documentation and Arduino code samples can be found on Github. The company has now launched a slicker version with Lilygo TTGO T-Watch-2000.
TTGO T-Watch-2020 specifications:
- SoC – Espressif ESP32 dual-core wireless processor with 520KB SRAM
- System Memory – 8MB PSRAM
- Storage – 16MB QSPI flash
- Display – 1.54-inch LCD capacitive touch screen
- Audio – Class-D amplifier, buzzer
- Connectivity – 802.11b/g/n WiFi 4 and Bluetooth 5.1 via ESP32
- Sensors – BMA423 three-axis accelerometer with built-in step counting algorithm, activity recognition / tracking, advanced gesture recognition.
- Misc – Power button (round), PCF8563 RTC clock, vibration motor
- Programming – Via Micro USB port (CP2104 USB to TTL chip)
- Battery
- 3.7V Lithium battery
- Charging – 5V/1A via Micro USB port; AXP202 PMIC
- Dimensions – TBD
- Weight – 58.5 grams
- Temperature Range – -40°C ~ +85°C (TBC…)
You’ll find Arduino samples for most/all features of the watch on a new Github repository, as well as documentation on ReadTheDocs that is for the original TTGO T-Watch, but should also work on the new smartwatch.
LilyGo TTGO T-Watch-2020 can be pre-ordered on Banggood or Tindie for about $30 including international shipping. If you need more customization the original T-Watch supports optional modules such as LoRa and GPS, various enclosure, and other accessories (mini-keyboard anyone?) which you’ll find on the aforementioned websites, as well as the company’s Aliexpress store.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.
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Looks interesting for experimentation, unfortunately it’s not possible to preorder it. When you click the “preorder” button, it requires to log in, then once logged in, the button turns gray and becomes ineffective. There’s no explanation (could be country of destination etc but who knows). Too bad, it looked fun and compact 🙁
I get the same problem with Banggood. Weird because there are already 131 pre-orders (unless that number is made up to generate sales…).
Tried again, it works now, I could pre-order one. I’ll see when it arrives.
Finally arrived after one month. Unfortunately the glass is broken. It’s does have a color screen and the touch sensor is pretty accurate. I have no project for it, but having a small battery-powered device able to connect to WiFi, having a color touchscreen and supporting a USB serial port can only open new perspectives 🙂
Still power-hungry. Minimum draw with screen off etc is 4mA, so assuming 100mAh battery (battery size never mentioned), max 24 hour run-time, daily charging required.
The banggood page says it has a 350mAh battery, but from what I have read the power draw minimum is probably higher.
On one of the questions they mentioned 350mAh. I doubt it since such a battery usually gets a bit fat, but the device is not that small so that remains possible.
The battery is 350mAh. Then from here:
https://github.com/Xinyuan-LilyGO/TTGO_TWatch_Library/blob/master/docs/power.md
It says:
“Off the screen, turn off WiFi, Bluetooth and other peripherals consume about 4mA (non-deep sleep), turn on the screen power, do not turn on WiFi, Bluetooth and other peripherals around 65mA, please refer to example -> SimpleWatch for the specific code.”
Assuming 100% efficiency (direct connection to the battery) and operation down to the battery’s cutoff voltage, that would result in 5hrs 23min with the screen always on (65mA drain), and 87hrs 30min (3.65 days) with the screen always off (4mA drain, but not deep sleep). This is with only the screen always on or off, and everything else always off.
Until someone gets a unit, there is actually no telling what battery is finally ships with. They could have packaging troubles, or sourcing troubles, or any number of other issues
I just got mine and it’s got a 350ma battery.
I have to say that they are doing a really good with the ESP32. It’s a shitty microcontroller though. But their marketing it great. If you take a look into the maker space, everybody is using it. Good for prototyping, bad really bad for production environments.
Can you expand on why it’s bad for production environments? Thanks!
Please explain your thinking.
Can someone confirm if this is a color screen? All of the specs just say LCD capacitive screen, and every single screenshot except for one shows a monochrome screen. The one that shows color is the black screen with the white and green text but we also know how much they love the photo shop things. Plus if it was color you would think they would show that in as many shots as possible, let alone mention it in the specs, which again neither of those things happen.
Color screen. I just received mine. Looks great!!