ワタリ
Watari is my Bangle.js watch.
| processor | Nordic 64 MHz nRF52832 ARM Cortex-M4 |
|---|---|
| RAM | 64 kB |
| flash | 512 kB on-chip, 4 MB external |
| display | 1.3″ 240×240 16-bit LCD with two-zone touch |
| GPS | UBlox UBX-M8130 |
| HR sensor | BD 1668 |
| accelerometer | KX023 |
| magnetometer | GMC303 3-axis compass |
| battery | 350 mAh 502527 Li-ion, 1 week standby |
| dimensions | 5×5×1.7 cm |
positioning
Formula for positioning text at the center of the display (xc, yc), given the scale (s), number of characters (n), and number of rows (r):
w = n * 6 * s
h = r * 8 * s
x = xc - (w / 2)
y = yc - (h / 2)
For example, a 3-row, 5-character-wide text block at a scale of 2 should be positioned at [90, 108] to be centered.
w = 60 = 5 * 6 * 2
h = 48 = 3 * 8 * 2
x = 90 = 120 - (60 / 2)
y = 108 = 132 - (48 / 2)
There’s a calculator in the lab.