temperature monitoring of 10k ntc

src/NerdMinerV2.ino.cpp

@@ -16,6 +16,7 @@
 #include "timeconst.h"
 #include "drivers/nerd-nos/bm1397.h"
 #include "drivers/nerd-nos/serial.h"
+#include "drivers/nerd-nos/adc.h"
 
 #ifdef NERD_NOS
 #include "mining_nerdnos.h"
@@ -147,6 +148,7 @@ void setup()
  #endif
 
  #ifdef NERD_NOS
+  nerdnos_adc_init();
   SERIAL_init();
   int chips = BM1397_init(200, 1);
   Serial.printf("found bm1397: %d\n", chips);

src/drivers/displays/tDisplayDriver.cpp

@@ -65,9 +65,13 @@ void tDisplay_MinerScreen(unsigned long mElapsed)
 
   // Print background screen
   background.pushImage(0, 0, MinerWidth, MinerHeight, MinerScreen);
-
+#ifdef NERD_NOS
+  Serial.printf(">>> Completed %s share(s), %s Khashes, avg. hashrate %s GH/s, %s °C\n",
+                data.completedShares.c_str(), data.totalKHashes.c_str(), data.currentHashRate.c_str(), data.currentTemperature.c_str());
+#else
   Serial.printf(">>> Completed %s share(s), %s Khashes, avg. hashrate %s KH/s\n",
                 data.completedShares.c_str(), data.totalKHashes.c_str(), data.currentHashRate.c_str());
+#endif
 
   // Hashrate
   render.setFontSize(35);

src/drivers/nerd-nos/adc.cpp

@@ -0,0 +1,48 @@
+#include <stdio.h>
+#include <math.h>
+#include "driver/adc.h"
+#include "esp_adc_cal.h"
+
+#define ADC_CHANNEL ADC1_CHANNEL_1  // GPIO2 corresponds to ADC1 channel 1 on ESP32-S3
+#define BETA 3380  // Beta value of the thermistor
+#define R0 10000   // Resistance at 25°C (10kΩ)
+#define ADC_MAX 4095  // Max ADC value for 12-bit resolution
+#define DEFAULT_VREF 1100  // Default VREF in millivolts for ESP32 ADC
+
+// ADC Calibration characteristics
+static esp_adc_cal_characteristics_t adc1_chars;
+
+void nerdnos_adc_init() {
+    // Configure the ADC
+    adc1_config_width(ADC_WIDTH_BIT_12);  // Set ADC width (12-bit)
+    adc1_config_channel_atten(ADC_CHANNEL, ADC_ATTEN_DB_11);  // Set attenuation to read the full range of 0 to 3.3V
+
+    // Characterize ADC at given attenuation
+    esp_adc_cal_characterize(ADC_UNIT_1, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_12, 0, &adc1_chars);
+}
+
+float nerdnos_get_temperature() {
+    // Convert the raw ADC value to a voltage using esp_adc_cal
+    uint32_t voltage_mv = esp_adc_cal_raw_to_voltage(adc1_get_raw(ADC_CHANNEL), &adc1_chars);  // Voltage in millivolts
+
+    // Convert millivolts to volts
+    float voltage = voltage_mv / 1000.0;
+
+    // Ensure the voltage is within a valid range
+    if (voltage <= 0) {
+        printf("Error: Invalid voltage reading.\n");
+        return -273.15; // Return a clearly invalid temperature to indicate an error
+    }
+
+    // Calculate the thermistor resistance using the voltage divider formula
+    // R_T = R0 * (Vout / (VREF - Vout))
+    float thermistor_resistance = R0 * (voltage / (3.3 - voltage));
+
+    // Use the Beta parameter equation to calculate the temperature in Kelvin
+    float temperature_kelvin = (float)(BETA / (log(thermistor_resistance / R0) + (BETA / 298.15)));
+
+    // Convert the temperature to Celsius
+    float temperature_celsius = temperature_kelvin - 273.15;
+
+    return temperature_celsius;
+}

src/drivers/nerd-nos/adc.h

@@ -0,0 +1,4 @@
+#pragma once
+
+void nerdnos_adc_init();
+float nerdnos_get_temperature();

src/drivers/nerd-nos/bm1397.cpp

@@ -63,8 +63,8 @@ static void _send_BM1397(uint8_t header, uint8_t *data, uint8_t data_len, bool d
     packet_type_t packet_type = (header & TYPE_JOB) ? JOB_PACKET : CMD_PACKET;
     uint8_t total_length = (packet_type == JOB_PACKET) ? (data_len + 6) : (data_len + 5);
 
-    // allocate memory for buffer
-    unsigned char *buf = (unsigned char *)malloc(total_length);
+    // memory for buffer
+    uint8_t buf[total_length];
 
     // add the preamble
     buf[0] = 0x55;
@@ -93,8 +93,6 @@ static void _send_BM1397(uint8_t header, uint8_t *data, uint8_t data_len, bool d
 
     // send serial data
     SERIAL_send(buf, total_length, debug);
-
-    free(buf);
 }
 
 static void _send_read_address(void)

src/drivers/nerd-nos/mining.cpp

@@ -129,7 +129,6 @@ void nerdnos_create_job(mining_subscribe *mWorker, mining_job *job, bm_job_t *ne
     calculate_merkle_root_hash(coinbase_tx.c_str(), job, merkle_root);
 
     //Serial.printf("asic merkle root: %s\n", merkle_root);
-    // we need malloc because we will save it in the job array
     construct_bm_job(job, merkle_root, 0x1fffe000, next_job);
 
     next_job->jobid = strdup(job->job_id.c_str());

src/monitor.cpp

@@ -11,6 +11,7 @@
 
 #ifdef NERD_NOS
 #include "mining_nerdnos.h"
+#include "drivers/nerd-nos/adc.h"
 #endif
 
 extern uint32_t templates;
@@ -243,11 +244,19 @@ String getCurrentHashRate(unsigned long mElapsed) {
   // we have too little space for 2 digits after the decimal point
   return String(nerdnos_get_avg_hashrate(), 1);
 }
+
+String getCurrentTemperature() {
+  return String(nerdnos_get_temperature(), 2);
+}
 #else
 String getCurrentHashRate(unsigned long mElapsed)
 {
   return String((1.0 * (elapsedKHs * 1000)) / mElapsed, 2);
 }
+
+String getCurrentTemperature() {
+  return String(0.0, 2);
+}
 #endif
 
 mining_data getMiningData(unsigned long mElapsed)
@@ -269,6 +278,7 @@ mining_data getMiningData(unsigned long mElapsed)
   data.totalMHashes = Mhashes;
   data.totalKHashes = totalKHashes;
   data.currentHashRate = getCurrentHashRate(mElapsed);
+  data.currentTemperature = getCurrentTemperature();
   data.templates = templates;
   data.bestDiff = best_diff_string;
   data.timeMining = timeMining;

src/monitor.h

@@ -73,6 +73,7 @@ typedef struct {
   String valids;
   String temp;
   String currentTime;
+  String currentTemperature;
 }mining_data;
 
 typedef struct {