def main():
# setup colour map
cmap = cm.get_cmap('Spectral_r')
# set up display
pygame.init()
pygame.font.init()
display = pygame.display.set_mode((320, 240))
pygame.display.set_caption('Thermal Cam')
pygame.mouse.set_visible(True)
font = pygame.font.SysFont('freemono', 10)
# mlx90640 settings
MLX_I2C_ADDR = 0x33
hertz_default = 8
API.SetRefreshRate(MLX_I2C_ADDR, hertz_to_refresh_rate[hertz_default])
API.SetChessMode(MLX_I2C_ADDR)
# Extract calibration data from EEPROM and store in RAM
eeprom_data = ffi.new("uint16_t[832]")
params = ffi.new("paramsMLX90640*")
API.DumpEE(MLX_I2C_ADDR, eeprom_data)
API.ExtractParameters(eeprom_data, params)
TA_SHIFT = 8 # the default shift for a MLX90640 device in open air
emissivity = 0.95
frame_buffer = ffi.new("uint16_t[834]")
image_buffer = ffi.new("float[768]")
last = time.monotonic()
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
quit()
API.GetFrameData(MLX_I2C_ADDR, frame_buffer);
now = time.monotonic()
diff = now - last
last = now
# reflected temperature based on the sensor
# ambient temperature
tr = API.GetTa(frame_buffer, params) - TA_SHIFT
# The object temperatures for all 768 pixels in a
# frame are stored in the mlx90640To array
API.CalculateTo(frame_buffer, params, emissivity, tr, image_buffer);
ta_np = temperature_data_to_ndarray(image_buffer)
ta_img = td_to_image(ta_np, cmap)
pyg_img = pygame.image.fromstring(ta_img.tobytes(), ta_img.size, ta_img.mode)
display.blit(pyg_img, (0,0))
show_text(display, "Calc Hz: %03.1f" % (1/diff), (0, 10+2), font, action=increment_refresh_rate)
show_text(display, "Temp Ref: %05.1f" % tr, (0, 10+2+10+2), font)
pygame.display.update()
for i in range(5):
print(params.outlierPixels[i])
# TODO: if absolute - wait 4 mins
TA_SHIFT = 8 # the default shift for a MLX90640 device in open air
emissivity = 0.95
frame_buffer = ffi.new("uint16_t[834]")
image_buffer = ffi.new("float[768]")
print("Calc Hertz should be close to chosen value (%s)" % hertz)
last = time.monotonic()
while True:
API.GetFrameData(MLX_I2C_ADDR, frame_buffer)
now = time.monotonic()
diff = now - last
print("Calc Hz: %s" % (1 / diff))
last = now
# reflected temperature based on the sensor
# ambient temperature
tr = API.GetTa(frame_buffer, params) - TA_SHIFT
# The object temperatures for all 768 pixels in a
# frame are stored in the mlx90640To array
API.CalculateTo(frame_buffer, params, emissivity, tr, image_buffer)
print("Subpage no: %s" % API.GetSubPageNumber(frame_buffer))
print(temperature_data_to_ndarray(image_buffer))
def get_temp_array(self):
API.GetFrameData(MLX_I2C_ADDR, frame_buffer);
tr = API.GetTa(frame_buffer, params) - TA_SHIFT
API.CalculateTo(frame_buffer, params, emissivity, tr, image_buffer);
return temperature_data_to_ndarray(image_buffer)