らずぱいでIoT 第９回（python版 気温・気圧・湿度計算）
らずぱいでIoT 第９回（python版 気温・気圧・湿度計算）
今回は、いよいよpython版のレジスタの読取り・計算・表示の全プログラムです。 このプログラムでは、Dict(連想配列)を使う事でチップ説明書にあるレジスタアドレスと一致するように工夫してあります。 プログラムの内容自体は、前回のチップ説明書の中にある保障式を今まで書いてきたプログラムに合うように書き直したものです。 ------------------------------------- 以下ソース #!/usr/bin/python import smbus import time SMBUS_NUMBER = 1 SMBUS_ADDR = 0x77 SMBUS_REG_CONF = 0xF5 SMBUS_REG_CTRL_MEAS = 0xF4 SMBUS_REG_CTRL_HUM = 0xF2 dig_T = {} dig_P = {} dig_H = {} calib = {} n = 0x88 while n <= 0xA1: ＿＿ calib[n] = 0 ＿＿ n = n + 1 n = 0xE1 while n <= 0xF0: ＿＿ calib[n] = 0 ＿＿ n = n + 1 n = 0xF7 while n <= 0xFE: ＿＿ calib[n] = 0 ＿＿ n = n + 1 bus = smbus.SMBus(SMBUS_NUMBER) bus.write_byte_data(SMBUS_ADDR,SMBUS_REG_CONF,0xA0) bus.write_byte_data(SMBUS_ADDR,SMBUS_REG_CTRL_HUM,0x01) bus.write_byte_data(SMBUS_ADDR,SMBUS_REG_CTRL_MEAS,0x25) time.sleep(0.1) for k in calib.keys(): ＿＿ calib[k] = bus.read_byte_data(SMBUS_ADDR, k) dig_T[1] = (calib[0x89] << 8 | calib[0x88]) dig_T[2] = (calib[0x8B] << 8 | calib[0x8A]) dig_T[3] = (calib[0x8D] << 8 | calib[0x8C]) dig_P[1] = (calib[0x8F] << 8 | calib[0x8E]) dig_P[2] = (calib[0x91] << 8 | calib[0x90]) dig_P[3] = (calib[0x93] << 8 | calib[0x92]) dig_P[4] = (calib[0x95] << 8 | calib[0x94]) dig_P[5] = (calib[0x97] << 8 | calib[0x96]) dig_P[6] = (calib[0x99] << 8 | calib[0x98]) dig_P[7] = (calib[0x9B] << 8 | calib[0x9A]) dig_P[8] = (calib[0x9D] << 8 | calib[0x9C]) dig_P[9] = (calib[0x9F] << 8 | calib[0x9E]) dig_H[1] = calib[0xA1] dig_H[2] = (calib[0xE2] << 8 | calib[0xE1]) dig_H[3] = (calib[0xE3]) dig_H[4] = (calib[0xE4] << 4 | calib[0xE5] & 0xf) dig_H[5] = (calib[0xE6] << 4 | calib[0xE5] >> 4) dig_H[6] = (calib[0xE7]) for i in [2,3]: ＿＿ if (dig_T[i] & 0x8000): ＿＿＿＿ dig_T[i] = (-dig_T[i] ^ 0xffff)+1 for i in [2,3,4,5,6,7,8,9]: ＿＿ if (dig_P[i] & 0x8000): ＿＿＿＿ dig_P[i] = (-dig_P[i] ^ 0xffff)+1 for i in [2,4,5]: ＿＿ if (dig_H[i] & 0x8000): ＿＿＿＿ dig_H[i] = (-dig_H[i] ^ 0xffff)+1 if (dig_H[6] & 0x80): ＿＿ dig_H[6] = (-dig_H[6] ^ 0xff)+1 raw_T = calib[0xFA] << 12 | calib[0xFB] << 4 | calib[0xFC] >> 4 raw_P = calib[0xF7] << 12 | calib[0xF8] << 4 | calib[0xF9] >> 4 raw_H = calib[0xFD] << 8 | calib[0xFE] tv1 = ((raw_T >> 3) - (dig_T[1] << 1)) * (dig_T[2] >> 11) tv2 = (((raw_T >> 4) - dig_T[1]) * ((raw_T >> 4) - dig_T[1])) >> 12 tv2 = (tv2 * dig_T[3]) >> 14 t_fine = tv1 + tv2 Temp = ((t_fine * 5 + 128) >> 8) / 100.0 pv1 = (t_fine / 2.0) - 64000 pv2 = ((pv1 / 4.0) * (pv1 / 4.0) / 2048) * dig_P[6] pv2 = pv2 + ((pv1 * dig_P[5]) * 2.0) pv2 = (pv2 / 4.0) + (dig_P[4] * 65536.0) pv1 = (((dig_P[3] * (((pv1 /4.0) * (pv1 * 4.0)) /8192)) / 8) + ((dig_P[2] * pv1) / 2.0)) / 262144 pv1 = ((32768 + pv1) * dig_P[1]) / 32768 if pv1 != 0: ＿＿ p = ((1048576 - raw_P) - (pv2 / 4096)) * 3125 ＿＿ if p < 0x80000000: ＿＿＿＿ p = (p * 2.0) / pv1 ＿＿ else: ＿＿＿＿ p = (p / pv1) * 2 ＿＿ pv1 = (dig_P[9] * (((p / 8.0) * (p / 8.0)) / 8192.0)) / 4096 ＿＿ pv2 = ((p / 4.0) * dig_P[8]) / 8192.0 ＿＿ p = p + ((pv1+ pv2 + dig_P[7]) /16.0) else: ＿＿ p = 0 Pres = p / 100.0 hv = t_fine - 76800.0 if hv != 0: ＿＿ hv = (raw_H - (dig_H[4] * 64.0 + dig_H[5]/16384.0 * hv)) * (dig_H[2] / 65536.0 * (1.0 + dig_H[6] / 67108864.0 * hv * (1.0 + dig_H[3] / 67108864.0 * hv))) ＿＿ hv = hv * (1.0 - dig_H[1] * hv / 524288.0) ＿＿ if hv > 100.0: ＿＿＿＿ hv = 100.0 ＿＿ elif hv < 0.0: ＿＿＿＿ hv = 0.0 else: ＿＿ hv=0.0 Hum = hv print "T=%2.1f P=%4.1f H=%1.2f" % (Temp,Pres,Hum) ------------------------------------- ここまで 尚、＿はスペースです。 ソースはこちらからダウンロードできます。