-
RED LED -
D26 -
Green LED -
D27 -
Blue LED -
D14 -
Yellow LED -
D12 -
Button (Active high) -
D25 -
Light sensor (analog) -
D33 -
LCD I2C - SDA:
D21 -
LCD I2C - SCL:
D22 -
Servo Motor:
D5 -
Buzzer:
D32
Wokwi Design screenshot:
Blynk Device Dashboard screenshot:
- V1: Red LED (switch)
- V2: Green LED (switch)
- V5: Blue LED (switch)
- V6: Yellow LED (switch)
- V3: Buzzer ON/OFF (switch)
- V7: Buzzer Frequency (Hz) slider
- V8: Servo Degree slider (0–180)
- V4: Button status indicator (virtual LED)
- V9: Light sensor chart (push every 5 s)
Implement the bindings between the Blynk dashboard and the Wokwi hardware in src/lab4_ex1.cpp.
- LEDs: mirror V1/V2/V5/V6 to pins D26/D27/D14/D12.
- Buzzer: when V3 turns ON, play tone at current V7 frequency for at most 3 seconds, then auto‑OFF; turning V3 OFF stops immediately. Frequency 0 = silent.
- Button: read D25, send state to V4 (pressed/released). Add minimal debounce.
- Servo: set D5 angle from V8 (0–180).
- Light sensor: read D33 every 5 seconds and push the raw ADC value to V9.
- LCD (I2C D21/D22):
- Line 1: latest event text (e.g., "Btn: pressed", "Red: ON", "Buz: ON 880Hz", "Servo: 90°").
- Line 2:
L=<value>showing the latest light reading.
- Non‑blocking: avoid long delays. Use timers/millis for 3 s buzzer cap and 5 s sensor polling.
Extend EX1 by adding OTA updates in src/lab4_ex2.cpp (use the provided OTA example as reference).
- While idle, all EX1 features remain functional.
- On OTA start, show
OTA...on LCD line 1; on success, showOTA OK. - In
lab4_ex2.cppcomments, note how to upload via OTA Blynk.
- EX1: All widgets work; LCD shows latest event (line 1) and light value (line 2); light pushed every 5 s; buzzer auto‑stops <= 3 s.
- EX2: OTA works and shows messages on LCD; EX1 features preserved.