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Diffstat (limited to 'ao-tools/lib/cc-convert.c')
| -rw-r--r-- | ao-tools/lib/cc-convert.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/ao-tools/lib/cc-convert.c b/ao-tools/lib/cc-convert.c index ac6962ba..8d6876a0 100644 --- a/ao-tools/lib/cc-convert.c +++ b/ao-tools/lib/cc-convert.c @@ -213,10 +213,19 @@ cc_accelerometer_to_acceleration(double accel, double ground_accel) return (ground_accel - accel) / count_per_mss; } +/* Value for the CC1111 built-in temperature sensor + * Output voltage at 0°C = 0.755V + * Coefficient = 0.00247V/°C + * Reference voltage = 1.25V + * + * temp = ((value / 32767) * 1.25 - 0.755) / 0.00247 + * = (value - 19791.268) / 32768 * 1.25 / 0.00247 + */ + double cc_thermometer_to_temperature(double thermo) { - return ((thermo / 32767 * 3.3) - 0.5) / 0.01; + return (thermo - 19791.268) / 32728.0 * 1.25 / 0.00247; } double |