e-Build Boards and Electronics

"ESP32 30pins Type C Wifi IoT Development Board

This ESP-32 Development Board with 2.4 GHz ultra-low power dual-mode Wi-Fi and Bluetooth dev kit is ideal for prototyping IoT or other devices which require wireless and internet connectivity, utilizing the powerful ESP32 microcontroller.

Features:
✅High performance-price ratio;
✅Small volume, easily embedded to other products;
✅Strong function with support LWIP protocol, Freertos;
✅Supporting three modes: AP, STA, and AP+STA;
✅Supporting the Lua program, easily to develop."""

"✅KY-037 High Sensitivity Sound Microphone Sensor Detection Module For Arduino AVR PIC

✅Features:
100% Brand New.
Size:32mm*17mm*8mm(length*width*height)
Main chip:LM393, Electret condenser microphone
Working voltage: DC 4-6V
Signal output indication
Single channel signal output
The output effective signal is low level
When there is sound, outputs low level and the signal light
Can be used for Acoustic control light , give sound and light alarm working with Photosensitive sensor ,and sound control, sound detect
Circuit board output switch quantity
Note: The Maximum induction distance is 0.5"

"✅AHT20+BMP280 Temperature, Humidity and Air Pressure Module

This product consists of new AHT20 and BPM280 digital temperature and humidity sensors, with a 12C main output and support for simultaneous online access to multiple 12C electronic devices or modules
It can use a DC voltage of 2.8V-5V, with easy voltage adaptation, low power consumption, simple circuit, and accurate temperature measurement points. Stable and fast transmission speed
Connect using a 4P GROVE Test cable, making it convenient for users to use quickly
Size: 15 * 15mm
Working voltage: DC20-5V

✅Product features:

1: Simple circuit
2: Accurate temperature measurement points
3: Stable and fast transmission speed
4: Easy voltage adaptation and low power consumption
5: Easy to understand"

"✅6-30V Relay Module Switch Trigger Time Delay Circuit Timer Cycle Adjustable

✅Product introduction:
1. Operating voltage: 6--30V
2. Trigger Signal Source: High Level Trigger (3.0 V-24 V), signal ground and system ground are not common, which can increase anti-interference abilit
system (short circuit can also connect with a ground common)
3. Output Capacity: can control no more than DC 30V 5A AC or 220 V devices 5A
4. Optocoupler Isolation: improve the anti-interference ability, after the parameter setting, it will memory forever
Warning: Relay contact is passive and electricity production; 1 channel has the control function on / off
✅Operation mode:
P1: After triggered signal, power relay on time OP, then turn off; within the OP period following operation:
1) P1.1: signal being triggered again is not effective
2) P1.2: signal being triggered again, start time again
3) P1.3: signal being triggered again, reset; disconnect relay, stop timing
P2: giving the trigger signal, the time after shutdown relay CL power relay OP time; then timing, turn off the relay
P3.1: give the trigger signal after the power relay on time OP, CL shutdown time relay; then operating cycle above cycle gaive signal again, shutdown relay stop timing; cycle times (LOP) can be set
P3.2: after connecting. no need to trigger signal, power relay on time OP, CL shutdown time relay; then the operating cycle above timea cycle (LOP) can be set
Q4: keeping the function of the signal; if there is no trigger signal, the time will be canceled, relay stay connected; when the signal disappears, timing OP turn off the relay; over time, if no signal again, the time is cleared
✅Time interval:
0.1 s (minimum) ~ 999 min (maximum) continuously adjustable
how to choose the time interval:
in the selection of parameter set interface mode, and press the STOP button to select the time
# # #. if the decimal point is in some place, the time interval is s-1 999 s
xx. x is decimal place is ten, the time interval is 0.1 s 99.9 s-
x. x. x is the decimal point are all on, the time interval is 1 min-999 min
parameter Introduction: OP power over time, turn off time CL, LOP cycle times (1-999 times, ""---"" is unlimited cycle)
✅How to set the parameter:
1. First make sure relay operation mode
2. According to the operaiting relay mode, the main interface (power module will flash current operating mode; standard mode P1.1, then come intot main interface); long press SET key two seconds and then looen enter selection interface mode; by pressing UP, DOWN key to choose the mode setting
(P1.1 ~ P4)
3. After selecting the mode, press short SET to set the corresponding parameter, then the parameter you want to set will flash
(OP power in time; CL power off time; LOP cycle times, ""---"" is unlimited cycle ); by UP, DOWN to set the parameter value, support long press"