This project can be used to measure UV light levels. It uses an ML8511 UV sensors and outputs its value over BLE in units of mW/cm^2

Revision:
0:6d4b6c56a7ad
Child:
1:ab9f0e572c98
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sat Aug 22 15:21:53 2020 +0000
@@ -0,0 +1,104 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2015 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "mbed.h"
+
+#include "ble/services/iBeacon.h"
+
+BLE ble;
+const static char     DEVICE_NAME[] = "NRF52832";
+static const uint16_t uuid16_list[] = {0xabcd,0x1234};    
+DigitalOut Led(P0_25);
+Ticker ticker;
+void periodicCallback(void)
+{
+      
+    if (Led == 0)
+        Led = 1;
+    else
+        Led = 0;
+            
+}
+
+/**
+ * This callback allows the LEDService to receive updates to the ledState Characteristic.
+ *
+ * @param[in] params
+ *     Information about the characterisitc being updated.
+ */
+void onDataWrittenCallback(const GattWriteCallbackParams *params) {
+    
+}
+
+void onDataReadCallback(const GattReadCallbackParams *params) {
+  
+
+}
+/**
+ * This function is called when the ble initialization process has failed
+ */
+void onBleInitError(BLE &ble, ble_error_t error)
+{
+    /* Initialization error handling should go here */
+}
+
+void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params)
+{
+    BLE::Instance().gap().startAdvertising();
+}
+/**
+ * Callback triggered when the ble initialization process has finished
+ */
+void bleInitComplete(BLE::InitializationCompleteCallbackContext *params)
+{
+    BLE&        ble   = params->ble;
+    ble_error_t error = params->error;
+
+    if (error != BLE_ERROR_NONE) {
+        /* In case of error, forward the error handling to onBleInitError */
+        onBleInitError(ble, error);
+        return;
+    }
+
+    /* Ensure that it is the default instance of BLE */
+    if(ble.getInstanceID() != BLE::DEFAULT_INSTANCE) {
+        return;
+    }
+ 
+    ble.gap().onDisconnection(disconnectionCallback);
+    ble.gattServer().onDataWritten(onDataWrittenCallback);
+    ble.gattServer().onDataRead(onDataReadCallback); 
+
+    /* setup advertising */
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
+    ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
+    ble.gap().setAdvertisingInterval(1000); /* 1000ms. */
+    ble.gap().startAdvertising();
+}
+int main(void)
+{
+    ticker.attach(periodicCallback, 0.1); /* Poll devices every 100ms */
+    ble.init(bleInitComplete);
+    
+    /* SpinWait for initialization to complete. This is necessary because the
+     * BLE object is used in the main loop below. */
+    while (!ble.hasInitialized()) { /* spin loop */ }  
+    while (true) {
+        ble.waitForEvent(); // allows or low power operation            
+    }
+}