IRPyro TO API demo
Specific demo for the IRPyro TO with IRPyro API
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Important points to consider when using the IRPyro library with IRPyro TO.
A single sensor is configured by default as follows:
IRPyro_Sensor .CS_Port = 2, .CS_Pin = 1, .INT_Port = 1, .INT_Pin = 4, .address = 0x75, .number_of_active_channels = 1, .read_mode = 1, 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_DISABLE Clock output enabled to synchronize other IRPyro sensors .SYNC = MASTER IRPyro set as Master issues the synchronization to SLAVE .TEMP = TEMP_DISABLE .INT = INT_DISABLE IRPyro indicates data ready enable CCP .status_bit = CH_ENABLE Channel ready to collect data .Feedback_transconductance = TCONDUCT_0_15T Time constant selection .High_pass_filter_setting = HIGH_PASS_1HZ High pass filter set at 1Hz .Feedback_cap = FEEDBACK_3200_1280 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:
All the IRPyro TO sensors should be configured as MASTER. This is due to the pin limitation on the TO39 package, the SYNC and CLK lines are not available.
For each sensor (master)
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 The IRPyro TO 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.