diff --git a/main/ble.c b/main/ble.c
index a834c08..faa6748 100644
--- a/main/ble.c
+++ b/main/ble.c
@@ -35,15 +35,18 @@ static struct ble_gap_adv_params adv_params = {
 
 static uint16_t conn_handle;
 
+static uint16_t csf_handle;
 static uint16_t cs_handle[INPUTS_NUM];
 static uint16_t ev_handle[INPUTS_NUM];
 static uint16_t settings_handle[SETTINGS_CHRS_NUM];
 static uint16_t range_handle[RANGE_CHRS_NUM];
 
+static uint8_t csf_notify_state;
 static uint8_t cs_notify_state[INPUTS_NUM];
 static uint8_t ev_notify_state[INPUTS_NUM];
 static uint8_t range_notify_state;
 
+static struct ble_context csf_ctxt;
 static struct ble_context ev_ctxt[INPUTS_NUM];
 static struct ble_context cs_ctxt[INPUTS_NUM];
 static struct ble_context settings_ctxt[SETTINGS_CHRS_NUM];
@@ -104,6 +107,29 @@ static struct ble_gatt_dsc_def rvs_descr_array[INPUTS_NUM + 1][3];
 
 
 static struct ble_gatt_svc_def gatt_svr_svcs[] = {
+  [CSF_SVC_ID] = {
+    .type = BLE_GATT_SVC_TYPE_PRIMARY,
+    .uuid = BLE_UUID16_DECLARE(METROLOGY_SERVICE),
+    .characteristics = (struct ble_gatt_chr_def[]){
+      [0] = {
+        .uuid = BLE_UUID16_DECLARE(ELECTRIC_CURRENT_CHAR),
+        .access_cb = gatt_char_access_csf,
+        .flags = BLE_GATT_CHR_F_READ | BLE_GATT_CHR_F_NOTIFY,
+        .min_key_size = 0,
+        .val_handle = &csf_handle,
+        .arg = &csf_ctxt,
+        .descriptors = (struct ble_gatt_dsc_def[]){
+          [0] = {
+            .uuid = BLE_UUID16_DECLARE(CHAR_PRES_FORMAT),
+            .access_cb = gatt_char_access_csf,
+            .att_flags = BLE_ATT_F_READ,
+          },
+          { 0 },
+        },
+      },
+      {0},
+    },
+  },
   [CS_SVC_ID] = {
     .type = BLE_GATT_SVC_TYPE_PRIMARY,
     .uuid = BLE_UUID16_DECLARE(METROLOGY_SERVICE),
@@ -257,6 +283,8 @@ static int ble_gap_event(struct ble_gap_event *event, void* arg){
     case BLE_GAP_EVENT_SUBSCRIBE:
       ESP_LOGI(TAG, "Subscribe %d", event->subscribe.attr_handle);
 
+      if(event->subscribe.attr_handle == csf_handle)
+        csf_notify_state = event->subscribe.cur_notify;
       for(int i = 0; i < INPUTS_NUM; i++){
         if(event->subscribe.attr_handle == cs_handle[i])
           cs_notify_state[i] = event->subscribe.cur_notify;
@@ -319,6 +347,11 @@ static void generate_svc_defs(configuration* conf, measurements* meas, measureme
     range_ctxt[i].meas = meas;
     range_ctxt[i].meas_ctxt = meas_ctxt;
   }
+
+  csf_ctxt.handle = 0;
+  csf_ctxt.conf = conf;
+  csf_ctxt.meas = meas;
+  csf_ctxt.meas_ctxt = meas_ctxt;
 }
 
 void initBLE(configuration* conf, measurements* meas, measurements_ctxt* meas_ctxt){
@@ -335,6 +368,12 @@ void initBLE(configuration* conf, measurements* meas, measurements_ctxt* meas_ct
 }
 
 void notify_update(measurements* meas){
+  if(csf_notify_state){
+    ESP_LOGI(TAG, "notify current fused");
+    uint32_t data = meas->amperes_f;
+    struct os_mbuf* om = ble_hs_mbuf_from_flat(&data, sizeof(data));
+    ESP_ERROR_CHECK(ble_gattc_notify_custom(conn_handle, csf_handle, om));
+  }
   for(int i = 0; i < INPUTS_NUM; i++){
     if(cs_notify_state[i]){
       ESP_LOGI(TAG, "notify current %d", i);
diff --git a/main/gatt_svcs.c b/main/gatt_svcs.c
index cb02de9..d900eb1 100644
--- a/main/gatt_svcs.c
+++ b/main/gatt_svcs.c
@@ -269,3 +269,24 @@ int gatt_char_access_range(uint16_t conn_handle, uint16_t attr_handle, struct bl
 
   return rc ? BLE_ATT_ERR_INSUFFICIENT_RES : 0;
 }
+
+int gatt_char_access_csf(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt* ctxt, void* arg){
+  int rc = 0;
+
+  switch(ctxt->op){
+    case BLE_GATT_ACCESS_OP_READ_CHR:
+      ;
+      struct ble_context *c_ctxt = arg;
+  
+      uint32_t data = c_ctxt->meas->amperes_f;
+      rc = os_mbuf_append(ctxt->om, &data, sizeof(data));
+    break;
+    case BLE_GATT_ACCESS_OP_READ_DSC:
+      ;
+      rc = os_mbuf_append(ctxt->om, &current_char_pres_format, CHAR_PRESENTATION_FORMAT_SIZE);
+    break;
+  }
+
+  return rc ? BLE_ATT_ERR_INSUFFICIENT_RES : 0;
+}
+
diff --git a/main/gatt_svcs.h b/main/gatt_svcs.h
index ae36802..e11008f 100644
--- a/main/gatt_svcs.h
+++ b/main/gatt_svcs.h
@@ -2,7 +2,7 @@
 
 #include "host/ble_gatt.h"
 
-enum ble_services {CS_SVC_ID, RVS_SVC_ID, RANGE_SVC_ID, SETTINGS_SVC_ID, SVCS_NUM};
+enum ble_services {CSF_SVC_ID, CS_SVC_ID, RVS_SVC_ID, RANGE_SVC_ID, SETTINGS_SVC_ID, SVCS_NUM};
 enum settings_chars {RFRSH_RATE_ID, ZEROS_CALI_ID, ZEROS_CALI_RESET, ZEROS_CALI_NSAMP_ID, SETTINGS_CHRS_NUM};
 enum range_characteristics {AUTO_RANGE_ID, CURRENT_RANGE_ID, RANGE_CHRS_NUM};
 
@@ -17,6 +17,7 @@ struct char_pres_format {
   uint8_t descrL;
 };
 
+int gatt_char_access_csf(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt* ctxt, void* arg);
 int gatt_char_access_cs(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt* ctxt, void* arg);
 int gatt_char_access_ev(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt* ctxt, void* arg);
 int gatt_char_access_sampling_rate(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt* ctxt, void* arg);
diff --git a/main/measure.h b/main/measure.h
index bd99a6a..a3b5930 100644
--- a/main/measure.h
+++ b/main/measure.h
@@ -14,6 +14,7 @@ typedef struct {
 typedef struct {
   uint32_t *raw_volt;
   uint32_t *amperes;
+  uint32_t amperes_f;
 } measurements;
 
 typedef struct {
diff --git a/main/power_profiler.c b/main/power_profiler.c
index fcd6b45..3591c15 100644
--- a/main/power_profiler.c
+++ b/main/power_profiler.c
@@ -31,6 +31,18 @@
 // number of consecutive times the input has to be below the threshold before switching
 #define UNDERRANGE_NUM 3
 
+
+// default source for the fused current measure
+#define DEFAULT_SRC X10
+// valeur pour laquelle on passe a la source de haute precision (mV)
+#define DEFAULT_SRC_SW_MIN 10
+// source de plus haute precision
+#define HIGH_PRECISION_SRC X100
+// valeur pour laquelle on passe a la source de plus basse precision (mV)
+#define DEFAULT_SRC_SW_MAX 700
+// source de plus haute precision
+#define LOW_PRECISION_SRC X1
+
 resistor_range ranges[] = {
   [R1] = {
     .pin = GPIO_NUM_6,
@@ -187,6 +199,13 @@ void app_main(void){
       meas_amp[i] = buff;
     }
 
+    if(meas_volts[DEFAULT_SRC] < DEFAULT_SRC_SW_MIN)
+      meas.amperes_f = meas_amp[HIGH_PRECISION_SRC];
+    else if(meas_volts[DEFAULT_SRC] > DEFAULT_SRC_SW_MAX)
+      meas.amperes_f = meas_amp[LOW_PRECISION_SRC];
+    else
+      meas.amperes_f = meas_amp[DEFAULT_SRC];
+
     if(meas_volts[UNDERRANGE_SRC] < UNDERRANGE_MV){
       underrange_counter++;
       if(underrange_counter > UNDERRANGE_NUM && main_conf.auto_range){