mirror of https://github.com/wb2osz/direwolf.git
37 lines
981 B
Python
37 lines
981 B
Python
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#!/usr/bin/python
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# Part of Dire Wolf APRS Telemetry Toolkit, WB2OSZ, 2015
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# Derived from
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# https://github.com/adafruit/Adafruit-Raspberry-Pi-Python-Code/blob/master/Adafruit_ADS1x15/ads1x15_ex_singleended.py
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import time, signal, sys
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from Adafruit_ADS1x15 import ADS1x15
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ADS1015 = 0x00 # 12-bit ADC
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ADS1115 = 0x01 # 16-bit ADC
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# Set ADC full scale to 2048 mV.
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# Can't use original 4096 with 3.3V supply.
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gain = 2048
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# Select the sample time, 1/sps second.
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# Longer is better to average out noise.
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sps = 64
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# Set this to ADS1015 or ADS1115 depending on the ADC you are using!
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adc = ADS1x15(ic=ADS1115)
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# Values for voltage divider on ADC input.
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r1 = 1000000.
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r2 = 100000.
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# Read channel 0 in single-ended mode using the settings above
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volts = adc.readADCSingleEnded(0, gain, sps) * 0.001 * (r1+r2) / r2
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# Calibration correction specific to my hardware.
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# (multiply by expected value, divide by uncalibrated result.)
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#volts = volts * 4.98 / 4.889
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print "%.3f" % (volts)
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