IoT and Sensor Integration 

IoT (Internet of Things) and Sensor Integration: Learn the fundamentals of Internet of Things (IoT) with this hardware focused course, designed for both beginners and tech enthusiasts. Learn to set up and program IoT devices like the ESP32 microcontroller using Arduino Integrated Development Environment (IDE), and explore key concepts like Input/ Outputs pins, sensors, and actuators. Dive into MQTT telemetry standard for reliable, light-weight device communication. Understand the importance of hardware choices, memory, and processing power for IoT projects. Gain practical experience while building real-world projects and skills to shape the future of connected technology for advanced manufacturing.

⭐Learning Goal: Quick start “how to” develop and build your own IIoT solution (with scale and affordability in mind) using off-the-shelf hardware and lightweight software.

What is possible?

Deploy a temperature and humidity monitor for critical infrastructure (e.g., a server room). Send alerts or trigger actions if values fall outside the safe zone. In this example, the device was powered by a battery, which can also be monitored for scenarios where wired power is not available. A dashboard was built to display the data sent over MQTT. server room monitoring

Hardware Summary 

3d render of PCB

Category	Components
Microcontroller	ESP32-WROOM-32
Sensors/Input	- Temperature & Humidity (SHT45) - Voltage, Current, Power (INA260) - Pushbutton (x4) - Rotary Encoder
Actuators	- Relay (10A, 277VAC, 30VDC) - DRV8871 (DC Motor Drive) - A4988 (Stepper Motor Drive) - 4 CH Servo (PCA9685)
Output	- RGB LED (x4) - OLED (128x64 pixel) - Buzzer

=============Use the links below to navigate source documents:===================

Reference	Value	Qty	DigiKey P/N	Adafruit P/N	AliExpress / Amazon Link
BZ1	Buzzer_5V	1	445-2525-1-ND
C3, C4, C7	0.1uF 50V	3	1276-1068-1-ND
C10, C11	0.22uF 50V CER	2	445-2283-1-ND
C12, C13, C14	22uF 50V	3	399-11438-1-ND
D2	D	1	S5AC-FDICT-ND
D10	LED	1	EALP05RDHRA2-ND
D12	SMF15A	1	SMF15A-E3-08CT-ND
D14	1N4148W	1	4878-1N4148WCT-ND
J3	ServoPort_04	1	S1012EC-40-ND
J5, J8	Screw_Terminal_2_P3.50mm	2	732-2747-ND
J7	PINHD_2x3_Male	1	S1012EC-40-ND
J15	Screw_Terminal_3_P5.00mm	1	277-1578-ND
K1	G5Q-1	1	Z2929-ND
Q1	MOSFET P-CH 30V 25A TO252	1	785-1106-1-ND
Q2, Q3	MMBT2222A	2	MMBT2222ATPMSCT-ND
R1, R2, R8, R22, R25, R26, R27, R28, R30, R34, R35, R36, R37, R38	10K	14	311-10.0KFRCT-ND
R3, R4, R5, R6, R7, R9, R16, R23	220	8	311-220FRCT-ND
R17, R21, R31	330	3	311-330FRCT-ND
R18, R19, R20, R32	1K	4	311-1.00KFRCT-ND
R33	100k	1	311-100KFRCT-ND
S1	SPDT Switch	1	EG5617-ND
SW1, SW2, SW3, SW4	Push_Button	4	2223-TS02-66-60-BK-160-LCR-D-ND
SW6	RotaryEncoder_Switch_MP	1	PEC11R-4220F-S0024-ND
U3	PCA9685PW	1	568-11925-1-ND
U4	SHT45	1		6174
U7	A4988	1		6109
U8	INA260	1		4226
U14	MAX40200AUK	1	175-MAX40203AUK+TCT-ND
U15	L7805	1	497-7255-1-ND
U18, U19	MP1584	2			AliExpress Link
U21	ESP32	1			Amazon Link (beware pinout)

✅ Hardware Fix List (PCB rev 1.1 -future-)

~~The INA260 power sensor is upstream of the reverse polarity circuit(oops).~~
- ~~A reverse polarity event will damage the INA260.~~
- ~~Need to moved INA260 circuit downstream of RPP.~~
~~The stepper “Sleep” pin is not wired.~~
- ~~Steppers with active code always consume power (holding torque).~~
- ~~No way to put them to sleep without a bodge wire on back of PCB.~~
Change ESP32 footprint to DigiKey p/n:
- 1965-ESP32-DEVKITC-32UE-ND (reliable source).