diff --git a/Production/firmware/mai_pico.uf2 b/Production/firmware/mai_pico.uf2
index 8cfc60a..fcaaf03 100644
Binary files a/Production/firmware/mai_pico.uf2 and b/Production/firmware/mai_pico.uf2 differ
diff --git a/Production/firmware/mai_pico_max_sense_test.uf2 b/Production/firmware/mai_pico_max_sense_test.uf2
deleted file mode 100644
index ad02dc8..0000000
Binary files a/Production/firmware/mai_pico_max_sense_test.uf2 and /dev/null differ
diff --git a/firmware/src/commands.c b/firmware/src/commands.c
index aa4950d..2f5e50d 100644
--- a/firmware/src/commands.c
+++ b/firmware/src/commands.c
@@ -361,8 +361,13 @@ static void print_raw_zones(const char *title, const uint16_t *raw, int num)
 static void handle_raw()
 {
     printf("Touch raw readings:\n");
-    printf("   |__1__|__2__|__3__|__4__|__5__|__6__|__7__|__8__|\n");
     const uint16_t *raw = touch_raw();
+    printf("   Sensor: 0: %s, 1: %s 2: %s\n",
+            touch_sensor_ok(0) ? "OK" : "ERR",
+            touch_sensor_ok(1) ? "OK" : "ERR",
+            touch_sensor_ok(2) ? "OK" : "ERR");
+
+    printf("   |__1__|__2__|__3__|__4__|__5__|__6__|__7__|__8__|\n");
     print_raw_zones("A", raw, 8);
     print_raw_zones("B", raw + 8, 8);
     print_raw_zones("C", raw + 16, 2);
diff --git a/firmware/src/mpr121.c b/firmware/src/mpr121.c
index a6cac5d..997453d 100644
--- a/firmware/src/mpr121.c
+++ b/firmware/src/mpr121.c
@@ -123,7 +123,7 @@ void mpr121_init(uint8_t i2c_addr)
     // (Auto configure result) alone. 
 
     // I want to max out sensitivity, I don't care linearity
-    const uint8_t usl = (3.3 - 0.1) / 3.3 * 256;
+    const uint8_t usl = 255; //(3.3 - 0.0) / 3.3 * 256;
     write_reg(i2c_addr, 0x7D, usl),  
     write_reg(i2c_addr, 0x7E, usl * 0.65),
     write_reg(i2c_addr, 0x7F, usl * 0.9);
@@ -133,21 +133,26 @@ void mpr121_init(uint8_t i2c_addr)
 
 #define ABS(x) ((x) < 0 ? -(x) : (x))
 
-static void mpr121_read_many(uint8_t addr, uint8_t reg, uint8_t *buf, size_t n)
+static bool mpr121_read_many(uint8_t addr, uint8_t reg, uint8_t *buf, size_t n)
 {
     i2c_write_blocking_until(I2C_PORT, addr, &reg, 1, true,
                              time_us_64() + IO_TIMEOUT_US);
-    i2c_read_blocking_until(I2C_PORT, addr, buf, n, false,
-                             time_us_64() + IO_TIMEOUT_US * n / 2);
+    int bytes = i2c_read_blocking_until(I2C_PORT, addr, buf, n, false,
+                                        time_us_64() + IO_TIMEOUT_US * n / 2);
+    return bytes == n;
 }
 
-static void mpr121_read_many16(uint8_t addr, uint8_t reg, uint16_t *buf, size_t n)
+static bool mpr121_read_many16(uint8_t addr, uint8_t reg, uint16_t *buf, size_t n)
 {
     uint8_t vals[n * 2];
-    mpr121_read_many(addr, reg, vals, n * 2);
+    if (!mpr121_read_many(addr, reg, vals, n * 2)){
+        return false;
+    }
+
     for (int i = 0; i < n; i++) {
         buf[i] = (vals[i * 2 + 1] << 8) | vals[i * 2];
     }
+    return true;
 }
 
 uint16_t mpr121_touched(uint8_t addr)
@@ -157,9 +162,9 @@ uint16_t mpr121_touched(uint8_t addr)
     return touched;
 }
 
-void mpr121_raw(uint8_t addr, uint16_t *raw, int num)
+bool mpr121_raw(uint8_t addr, uint16_t *raw, int num)
 {
-    mpr121_read_many16(addr, MPR121_ELECTRODE_FILTERED_DATA_REG, raw, num);
+    return mpr121_read_many16(addr, MPR121_ELECTRODE_FILTERED_DATA_REG, raw, num);
 }
 
 static uint8_t mpr121_stop(uint8_t addr)
diff --git a/firmware/src/mpr121.h b/firmware/src/mpr121.h
index 5b7cfcc..19da7b1 100644
--- a/firmware/src/mpr121.h
+++ b/firmware/src/mpr121.h
@@ -10,7 +10,7 @@
 void mpr121_init(uint8_t addr);
 
 uint16_t mpr121_touched(uint8_t addr);
-void mpr121_raw(uint8_t addr, uint16_t *raw, int num);
+bool mpr121_raw(uint8_t addr, uint16_t *raw, int num);
 void mpr121_filter(uint8_t addr, uint8_t ffi, uint8_t sfi, uint8_t esi);
 void mpr121_sense(uint8_t addr, int8_t sense, int8_t *sense_keys, int num);
 void mpr121_debounce(uint8_t addr, uint8_t touch, uint8_t release);
diff --git a/firmware/src/touch.c b/firmware/src/touch.c
index 4e6175e..1320cdb 100644
--- a/firmware/src/touch.c
+++ b/firmware/src/touch.c
@@ -88,13 +88,23 @@ void touch_update()
     touch_stat();
 }
 
+static bool sensor_ok[3];
+bool touch_sensor_ok(unsigned i)
+{
+    if (i < 3) {
+        return sensor_ok[i];
+    }
+    return false;
+}
+
 const uint16_t *touch_raw()
 {
     static uint16_t readout[36];
     uint16_t buf[36];
-    mpr121_raw(MPR121_ADDR, buf, 12);
-    mpr121_raw(MPR121_ADDR + 1, buf + 12, 12);
-    mpr121_raw(MPR121_ADDR + 2, buf + 24, 10);
+
+    for (int i = 0; i < 3; i++) {
+        sensor_ok[i] = mpr121_raw(MPR121_ADDR + i, buf + i * 12, 12);
+    }
 
     for (int i = 0; i < 34; i++) {
         readout[touch_map[i]] = buf[i];
diff --git a/firmware/src/touch.h b/firmware/src/touch.h
index 129650b..49f41fd 100644
--- a/firmware/src/touch.h
+++ b/firmware/src/touch.h
@@ -15,6 +15,8 @@ bool touch_touched(unsigned key);
 uint64_t touch_touchmap();
 
 const uint16_t *touch_raw();
+bool touch_sensor_ok(unsigned i);
+
 void touch_update_config();
 unsigned touch_count(unsigned key);
 void touch_reset_stat();