103 lines
2.4 KiB
Go
103 lines
2.4 KiB
Go
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package main
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// Thermal camera example using AMG88xx 8x8 IR sensor.
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// Connect the sensor to I2C1: SDA=P0_17, SCL=P0_20 (3.3V power).
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//
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// The 8x8 sensor data is scaled to 24x24 with bilinear interpolation and
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// rendered with an iron-palette color map on the 240x135 display.
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// Each scaled pixel is drawn as a 10x5 px block → 240x120 total, centered.
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import (
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"image"
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"machine"
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draw2 "golang.org/x/image/draw"
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"tinygo.org/x/drivers/amg88xx"
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"tinygo.org/x/drivers/st7789"
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)
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const (
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sensorSize = 8 // AMG88xx is 8x8
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scaledSize = 24 // intermediate bilinear-scaled image
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blockW = 10 // px per scaled pixel (horizontal): 24*10 = 240
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blockH = 5 // px per scaled pixel (vertical): 24*5 = 120
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yOffset = 7 // center 120px vertically in 135px display: (135-120)/2
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)
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var (
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display st7789.Device
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data [sensorSize * sensorSize]int16
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)
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func main() {
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machine.SPI0.Configure(machine.SPIConfig{
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SCK: machine.P1_01,
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SDO: machine.P1_02,
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Frequency: 8000000,
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Mode: 0,
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})
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machine.I2C1.Configure(machine.I2CConfig{
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SDA: machine.P0_17,
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SCL: machine.P0_20,
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Frequency: 400000,
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})
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display = st7789.New(machine.SPI0,
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machine.P1_15, // TFT_RESET
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machine.P1_13, // TFT_DC
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machine.P0_10, // TFT_CS
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machine.P0_09) // TFT_LITE
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display.Configure(st7789.Config{
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Rotation: st7789.ROTATION_90,
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Width: 135,
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Height: 240,
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RowOffset: 40,
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ColumnOffset: 53,
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})
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camera := amg88xx.New(machine.I2C1)
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camera.Configure(amg88xx.Config{})
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src := image.NewRGBA(image.Rect(0, 0, sensorSize, sensorSize))
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dst := image.NewRGBA(image.Rect(0, 0, scaledSize, scaledSize))
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for {
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camera.ReadPixels(&data)
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// map each sensor pixel to a palette color
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for j := 0; j < sensorSize; j++ {
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for i := 0; i < sensorSize; i++ {
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v := data[63-(i+j*sensorSize)]
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// clamp to 18°C–33°C range → index 0–432
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if v < 18000 {
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v = 0
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} else {
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v = (v - 18000) / 36
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if v > 432 {
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v = 432
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}
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}
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src.Set(i, j, colors[v])
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}
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}
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// bilinear upscale 8x8 → 24x24
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draw2.BiLinear.Scale(dst, dst.Bounds(), src, src.Bounds(), draw2.Over, nil)
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// draw horizontally mirrored (acts as a selfie mirror)
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for j := 0; j < scaledSize; j++ {
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for i := 0; i < scaledSize; i++ {
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display.FillRectangle(
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int16((scaledSize-1-i)*blockW),
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yOffset+int16(j)*blockH,
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blockW, blockH,
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dst.RGBAAt(i, j),
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)
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}
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}
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}
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}
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