IRPyro API unit test console
Functions for single and multiple sensor configurations in a Unit test format
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Important points to consider when using the IRPyro library.
A single sensor is configured by default as follows:
AFE .S7_S0 = 0, Sets the sampling rate to 1,000 samples per second. .LP = LOW_POWER_DISABLE Low power sets the sampling rate to 166 samples per second. .HP = HP_ENABLE High pass filter enabled .C_LP = LOW_PASS_180 Low pass filter set at 180Hz .CLK_OUT = CLK_ENABLE Clock output enabled to synchronize other IRPyro sensors .SYNC = MASTER IRPyro set as Master issues the synchronization to SLAVE .TEMP = TEMP_DISABLE .INT = INT_ENABLE IRPyro indicates data ready enable CCP .status_bit = CH_ENABLE Channel ready to collect data .Feedback_transconductance = TCONDUCT_1_2T Time constant selection .High_pass_filter_setting = HIGH_PASS_1HZ High pass filter set at 1Hz .Feedback_cap = FEEDBACK_50_20 Feedback capacitance WUP .UHT = MAX_WUP_THRESHOLD Upper High Threshold = 255 events .ULT = MAX_WUP_THRESHOLD Upper Low Threshold = 255 events .LHT = MIN_WUP_THRESHOLD Low High Threshold = 0 events .LLT = MIN_WUP_THRESHOLD Low Low Threshold = 0 events .WT_Threshold = DEFAULT_NO_EVENTS Wake up time Threshold = 10 events .DP0_DP2 = REF_CH_0 Active pixel channel .CH0_CH2 = SEL_CH_2 Reference channel .ST = SLEEP_MODE_ONE_CH Sleep mode type
Multiple sensors are configured by default as follows:
One master, and the rest of the sensors as slaves of the master
For each sensor (master or slave)
The sample rate, represented by the S0-S7 byte of the AFE register, is affected by the power mode of the IRPyro sensor. In normal power mode the sensor takes a sample every x number of milliseconds, where x equals the value of the S0_S7 register. In low power mode the sensor takes a sample every (S0_S7 * 6) milliseconds.
Data collection speed Single sensor, single pixel enabled At the maximum sample rate of 1,000 samples per second, with I2C configured at 1MHz it takes 0.13 ms to complete a FIFO_ACTIVE + FIFO_CLEAR command, when the IRPyro has one channel active. If we take 1 ms as a time reference with this timings it is possible to collect samples of 7 devices sequentially before the first device produces a new frame of data. Single sensor with four pixels enabled The IRPyro with 4 channels active completes the FIFO_ACTIVE + FIFO_CLEAR operation in 0.22 ms with the possibility of collecting samples from 5 devices sequentially before the first device produces a new frame of data.