ads1115 adc  (Texas Instruments)

Journal: Sensors (Basel, Switzerland)

Article Title: Comparative Assessment of PPG-Derived HRV Using MAX30102 Sensor and Analog Circuitry with ADS1115 ADC

doi: 10.3390/s26082487

Figure Lengend Snippet: PPG acquisition front-end: 940 nm LED/photodiode illumination and biasing, passive AC coupling (2.2 μ F) with 560 k Ω bleed to ground, an LM358 active stage with frequency-dependent feedback (100 k Ω ‖ 220 nF) and 4.7 k Ω reference, followed by a buffering stage and digital back-ends (ADS1115 and MAX30102) interfaced to an ESP32-S3 via I 2 C. Discrete LEDs and components were chosen over fully integrated optical modules to enable customized placement and intensity control, reduce cost, and leverage their widespread commercial availability.

Article Snippet: In this PPG project, we use the ESP32-S3 (Espressif Systems, Shanghai, China), the MAX30102 (Maxim Integrated, San Jose, CA, USA), and the ADS1115 ADC (Texas Instruments, Dallas, TX, USA).

Techniques: Control

Journal: Sensors (Basel, Switzerland)

Article Title: Comparative Assessment of PPG-Derived HRV Using MAX30102 Sensor and Analog Circuitry with ADS1115 ADC

doi: 10.3390/s26082487

Figure Lengend Snippet: PPG signal acquisition at rest using both index fingers (Experiment 1). The GUI displays three channels: IR (880 nm) and RED (660 nm) signals from the MAX30102 sensor, and an IR (940 nm) channel acquired via the ADS1115. The PPG signal from the MAX30102 appears inverted relative to the ADS1115 signal; the systolic peak corresponds to the highest point of the PPG waveform [ , ].

Article Snippet: In this PPG project, we use the ESP32-S3 (Espressif Systems, Shanghai, China), the MAX30102 (Maxim Integrated, San Jose, CA, USA), and the ADS1115 ADC (Texas Instruments, Dallas, TX, USA).

Techniques:

Journal: Sensors (Basel, Switzerland)

Article Title: Comparative Assessment of PPG-Derived HRV Using MAX30102 Sensor and Analog Circuitry with ADS1115 ADC

doi: 10.3390/s26082487

Figure Lengend Snippet: Bland–Altman plot for Experiment 1 comparing BPM estimates derived from the MAX (maxir1 and maxred1) and ADS1115 (ads1) sensors.

Article Snippet: In this PPG project, we use the ESP32-S3 (Espressif Systems, Shanghai, China), the MAX30102 (Maxim Integrated, San Jose, CA, USA), and the ADS1115 ADC (Texas Instruments, Dallas, TX, USA).

Techniques: Derivative Assay

Journal: Sensors (Basel, Switzerland)

Article Title: Comparative Assessment of PPG-Derived HRV Using MAX30102 Sensor and Analog Circuitry with ADS1115 ADC

doi: 10.3390/s26082487

Figure Lengend Snippet: Bland–Altman plot for Experiment 2 comparing BPM estimates derived from the MAX (maxir2 and maxred2) and ADS1115 (ads2) sensors.

Article Snippet: In this PPG project, we use the ESP32-S3 (Espressif Systems, Shanghai, China), the MAX30102 (Maxim Integrated, San Jose, CA, USA), and the ADS1115 ADC (Texas Instruments, Dallas, TX, USA).

Techniques: Derivative Assay

Journal: Sensors (Basel, Switzerland)

Article Title: Comparative Assessment of PPG-Derived HRV Using MAX30102 Sensor and Analog Circuitry with ADS1115 ADC

doi: 10.3390/s26082487

Figure Lengend Snippet: ICC values per subject for two experimental conditions, comparing measurements obtained from the MAX30102 (IR/RED) and the ADS1115 (IR) acquisition.

Article Snippet: In this PPG project, we use the ESP32-S3 (Espressif Systems, Shanghai, China), the MAX30102 (Maxim Integrated, San Jose, CA, USA), and the ADS1115 ADC (Texas Instruments, Dallas, TX, USA).

Techniques:

Journal: Sensors (Basel, Switzerland)

Article Title: Comparative Assessment of PPG-Derived HRV Using MAX30102 Sensor and Analog Circuitry with ADS1115 ADC

doi: 10.3390/s26082487

Figure Lengend Snippet: Comparison of the mean and standard deviation of the SNR for MAX30102 (IR and RED) and ADS1115-based measurements across Experiments 1 and 2.

Article Snippet: In this PPG project, we use the ESP32-S3 (Espressif Systems, Shanghai, China), the MAX30102 (Maxim Integrated, San Jose, CA, USA), and the ADS1115 ADC (Texas Instruments, Dallas, TX, USA).

Techniques: Comparison, Standard Deviation