Fixed and Inconsistent RSSI Values in ESP32 Board and R200 Chip

[hrefcl]

Description:

I am working on a system that involves an ESP32 board and a R200 chip for UHF signal reading. I have encountered a significant issue with the RSSI value readings. Specifically, the value assigned to RSSI, which is stored in _buffer[6], remains constant and does not show the expected variability. Additionally, I have noticed a numeric value in _buffer[5] varying between 213 and 160, which does not align with typical RSSI values in dBm.

Additional Details:

Components Used: ESP32 board, R200 chip. Symptom of the Problem: The RSSI value, as defined in the code and located in _buffer[6], is constant and unchanging, suggesting a problem in the reading or interpretation of the RSSI value. Observation in _buffer[5]: A fluctuating numeric value between 213 and 160 is recorded, not corresponding to standard RSSI measurements in dBm. Steps to Reproduce:

Set up the ESP32 board with the R200 chip for UHF reading. Perform capturing and reading of RSSI values. Observe the reported values in _buffer[6] and _buffer[5]. Expected Results: RSSI values should reflect the detected UHF signal strength, showing appropriate variations in dBm.

Actual Results:

The value in _buffer[6], designated as RSSI, remains constant and does not vary across measurements. The value in _buffer[5] fluctuates between 213 and 160, not aligning with a typical range of RSSI values in dBm. Any assistance or suggestions for diagnosing and correcting this issue would be greatly appreciated. Thank you in advance for your collaboration and support.

[adameus03]

@hrefcl Did you resolve this issue by any chance?

[hrefcl]

No, I have not solved this problem, my only solution was to measure the value delivered and based on the value delivered, make an approximate calculation of the distance, a similar example that I used to calculate the distance

float R200::calculateDistance(int rssi) { // RSSI a 0 metros (el valor más alto observado) const int rssiAtZeroMeters = 213; // RSSI a 1 metro const int rssiAtOneMeter = 190;

// La pendiente de la línea (cambio en RSSI por metro) float slope = float(rssiAtZeroMeters - rssiAtOneMeter);

// Calcular la distancia basada en la pendiente y la diferencia del RSSI observado float distance = (rssiAtZeroMeters - rssi) / slope;

return distance; }