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46 lines
1.7 KiB
C
46 lines
1.7 KiB
C
/*
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* Parameters for new varVppMeasureVpp()
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* Select the data set that matches your hardware variant or add a suitable data set.
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* 2024-02-14 Initial release
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*/
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#ifndef __AFTB_ADCPARMS_H__
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#define __AFTB_ADCPARMS_H__
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// Select your hardware version (AREF source)
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#define AREF_1V1 // Defined data sets AREF_3V3, AREF_1V1, AREF_3V3_R4
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// For best results, measure the voltage on AREF pin with a good multimeter and use this value for VREF
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#if defined(AREF_3V3)
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// Values for ATmega328P (NANO V3, UNO R3) AREF = EXTERNAL R7 = 3k3, Ri = 32k (original Afterburner)
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#define ADC_R5 (100.0) // R5 in kOhm as float
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#define ADC_R6 (20.0) // R6 in kOhm as float
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#define VREF (3.0) // Vref in Volts as float; Vref = 3.3V * 32k / (32k + 3k3) => 2.991V
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#define AREF_SOURCE EXTERNAL
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#elif defined(AREF_1V1)
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// Values for ATmega328P (NANO V3, UNO R3) AREF = INTERNAL 1.1V, R5 = 20k, R6 = 1k3, R7 not populated
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#define ADC_R5 (20.0) // R5 in kOhm as float
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#define ADC_R6 (1.3) // R6 in kOhm as float
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#define VREF (1.1) // Vref in Volts as float; Vref = 1.1V
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#define AREF_SOURCE INTERNAL
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#elif defined(AREF_3V3_R4)
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// Values for Renesas RA4M1 (UNO R4 Minima/WiFi) AREF = EXTERNAL R7 = 3k3, Ri = 130k (original Afterburner)
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#define ADC_R5 (100.0) // R5 in kOhm as float
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#define ADC_R6 (20.0) // R6 in kOhm as float
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#define VREF (3.2) // Vref in Volts as float; Vref = 3.3V * 130k / (130k + 3k3) => 3.218V
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#define AREF_SOURCE AR_EXTERNAL
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// You can add additional variants here
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#else
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// Invalid or missing AREF variant
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#undef ADC_R5
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#undef ADC_R6
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#undef VREF
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#undef AREF_SOURCE
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#error "Invalid or missing AREF variant\n"
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#endif
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#endif
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