servo and photoresistor in http routes

src/controller/photoresistor.ts

@@ -0,0 +1,15 @@
+import { Request, Response } from "express";
+import { board } from "../setup";
+import { analogRead } from "../promises";
+
+export async function readResistor (req: Request, res: Response): Promise<Response<string, any>> {
+    const { p } = req.params;
+    const pin: string = req.params.p.startsWith("A") ? req.params.p.slice(0, p.length) : req.params.p;
+
+    const resistance = await analogRead(board, pin);
+
+    return res.status(200).json({
+        status: 200,
+        message: `Analog pin ${p} resistance as ${resistance}°`
+    });
+}

src/controller/servo.ts

@@ -0,0 +1,22 @@
+import { Request, Response } from "express";
+import { board } from "../setup";
+
+export function rotateServo (req: Request, res: Response): Response<string, any> {
+    const { p } = req.params;
+    const pin: string = req.params.p.startsWith("A") ? req.params.p.slice(0, p.length) : req.params.p;
+    const angle: number = Number.parseInt(req.params.ang);
+
+    if (Number.isNaN(angle)) {
+        return res.status(400).json({
+            status: 400,
+            message: 'Invalid angle param, it should be integer'
+        });
+    }
+
+    board.servoWrite(pin, angle);
+
+    return res.status(200).json({
+        status: 200,
+        message: `Pin ${p} rotate as ${angle}°`
+    });
+}

src/promises/index.ts

@@ -11,7 +11,7 @@ export function digitalRead (board: Board, pin: number): Promise<number> {
     });
 }
 
-export function analogRead (board: Board, pin: number): Promise<number> {
+export function analogRead (board: Board, pin: string): Promise<number> {
     return new Promise((resolve, reject) => {
         board.analogRead(pin, (val) => {
             resolve(val);

src/routes/api.ts

@@ -4,6 +4,9 @@ import { Router } from "express";
 import { readLed, readRgbLed, writeLed, writeRgbLed } from "../controller/led";
 import { readPin, setPin } from "../controller/pin";
 import { piezoNoTone, piezoPlayNotes, piezoTone } from "../controller/piezo";
+import { rotateServo } from "../controller/servo";
+import { readResistor } from "../controller/photoresistor";
+
 import { isPinNumeric } from "../middleware/pin";
 
 const router: Router = Router();
@@ -25,4 +28,9 @@ router.patch('/piezo/', piezoTone);
 router.patch('/piezo/stop/', piezoNoTone);
 router.patch('/piezo/music/', piezoPlayNotes);
 
+// for real-time communication is deprecated and not recommended
+// use other protocol like websocket instead
+router.patch('/servo/:p/:m', rotateServo);
+router.get('/photoresistor/:p', readResistor);
+
 export default router;