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Basic programm to use hidapi and report temp/co2 from Holtek Semiconductor, Inc. USB-zyTemp (hidapi is python3-hidapi in debian buster)
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| from hidapi import Device | |
| vid = 0x04d9 | |
| pid = 0xa052 | |
| try: | |
| print("Opening the device") | |
| h = Device(vendor_id=vid, product_id=pid, blocking=False) | |
| #h.open(vid, pid) # TREZOR VendorID/ProductID | |
| print("Manufacturer: %s" % h.get_manufacturer_string()) | |
| print("Product: %s" % h.get_product_string()) | |
| print("Serial No: %s" % h.get_serial_number_string()) | |
| #print("Get feature report:") | |
| #print(h.get_feature_report(bytes(1),2)) | |
| print("Send feature report:") | |
| h.send_feature_report(bytearray([0xc4, 0xc6, 0xc0, 0x92, 0x40, 0x23, 0xdc, 0x96]), report_id=bytes(1)) | |
| try: | |
| while True: | |
| r = h.read(8) | |
| if r: | |
| # print('read: "{}"'.format(r)) | |
| metric = r[0] | |
| value = r[1] | |
| value_thousands = r[2] | |
| checksum = r[3] | |
| r4 = r[4] | |
| if r4 != 0x0d: | |
| continue | |
| print("Unexpected data from device") | |
| value_sum = metric + value + value_thousands | |
| #if checksum != metric + value + value_thousands: | |
| # continue | |
| # print("Checksum error") | |
| metric_name = "" | |
| value_shifted = value << 8 | |
| metric_value = value_shifted + value_thousands | |
| if metric == 0x42: | |
| metric_name = "Temperature" | |
| metric_value = metric_value / 16 - 273.15 | |
| elif metric == 0x50: | |
| metric_name = "CO2" | |
| elif metric == 0x44: | |
| metric_name = "Humidity" | |
| else: | |
| continue | |
| metric_name = "Unknown" | |
| print(hex(metric), metric_name, "%.1f" % metric_value) | |
| finally: | |
| print("Closing the device") | |
| h.close() | |
| h.close() | |
| except IOError as ex: | |
| print(ex) | |
| print("You probably don't have the hard-coded device.") | |
| print("Update the h.open() line in this script with the one") | |
| print("from the enumeration list output above and try again.") | |
| print("Done") |
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