Pantalla LCD TFT 2.4 pulgadas 240x320 SPI

The MAX9812 is a sound amplifier specially designed to treat the signal coming from microphones.
We can use it together with Arduino to measure sound from a processor like Arduino.
When we saw the modules with microphone we commented that, in general, the signal generated is too low to be registered correctly.
If we want to be able to measure sounds, we will have to amplify the signal. The MAX9812L has single / dual inputs, fixed gain of 20dB, bandwidth of 400 kHz, low noise and low signal distortion 0.015% THD.
There are two models, its supply voltage is 2.7V to 3.6V.
We can use the sensors with MAX9812 for applications that require measuring the intensity or frequency of the sound.

Display OLED 0.96" 128x64 White I2C 4 Pin features:
- Interface: I2C (logical level 3.3V)
- Resolution: 128x64
- Angle of view:> 160 degree
- Screen color: white
- Screen Dimension: 2.43cm / 0.96 "
- IC Controller: SSD1306
- Power supply: 3.3V - 5VDC
- Operating temperature: -20 ° C - 70 ° C
- Size: 2.2x 2.8x 1.2 cm / 0.87x 1.1x 0.47 "
- Application: smart watch, MP3, thermometer , instruments, DIY projects, etc ...
- It is an OLED display module with white display and with a dot matrix of a resolution 128x64 and an IC2 interface.
- The display includes the IC driver SSD1306 128 x 64 OLED / PLED Segment / Common Driver.

Screen OLED 0.96" 128x64 White SPI I2C 7 Pin features:
- Oled 0.96 "screen with 128 * 64 pixels
- Drive IC model SDD1306
- Power: 3V-5.5V - Viewing angle: 160 degrees
- SPI interface (I2C can be changed)
- Low consumption: 0.08W
- Operating temperature: -20 to 70 ºC
- PCB board dimension: 27 x 27mm
- Supports many control chip: 51 Series, MSP430 Series, STM32 / 2, CSR IC, etc.
- OLED technology offers high contrast, significantly improves black on screen energy efficiency - very low power consumption Applications: - Due to the size, quality and consumption of smart watch products, portable meters , medical devices, portable players, etc.

Descent module.
Use a multimeter to check the output voltage and adjust the potentiometer.
Control of tension.
LM2596 DC Voltmeter Converter 3A Step Down Adjustable Power features:
- Input voltage: 4.5-38V
- Output voltage: 1.25-36.5V
- Current output: 2A (max 3A with heat sink)
- Operating temperature: -40 to + 85 ºC
- Operating frequency: 150KHz
- Efficiency conversion: up to 92%
- Load Regulation: +/- 0.5%
- Voltage Regulation: +/- 2.5%
- Protection over temperature: the output switches off automatically
- Size: 62mm x 38mm x 15mm
Principal functions:
- Step-down converter with overcurrent protection
- Voltmeter up to 40V, remember to set the input voltage to 4.5V

Ideal to power your Arduino board through the power input.
5x 9v Battery Adapter Connector 6F22 with Cable features:

- Cable 15cm long
- Battery connector 9V, 6F22

It is ultra compact and very low consumption. It works at 2.4GHz frequencies (free frequency) and is ideal for telemetry projects, robots, peripheral control, video game control applications, remote temperature sensors, pressure, alarms, etc ... NRF24L01 + Wireless Transceiver Module 2.4GHz features:
- Based on chip NRF24L01 + Ultra Low Power
- Free band: 2.4GHz ISM
- Speed: 250kbps, 1Mbps, 2Mbps
- Working current - reception: 13 mA
- Transmission: 11 mA (900nA -deep sleep mode)
- Receiving sensitivity: -94dB 250kbps
- Coverage in closed spaces: 15m / 30m
- SPI interface
- Input voltage: 1.9V- 3.6V
- Input / output port voltage: 0V-3.3V / 5V
- Coverage in open areas: 100m approx.
- Clock frequency: 16MHz

This detection module that allows you to detect your heart rate and blood oxygen level from your Arduino project. You can monitor your blood oxygen level yourself to avoid going to the doctor or pharmacy on purpose. Simply press the sensor with your finger and wait for the reading of hemoglobin (Spo2), heart rate and Perfusion Index (PI%). It is a solution as an integrated heart rate sensor and pulse oximetry, which includes two LEDs, a photodetector and is optimized for analog low noise optics.

NodeMcu module based on ESP8266 controller and programming in Lua language
NodeMcu is equipped with 10 GPIO, PWM, I2C, 1-wire and ADC
ESP8266-12E is an improved version of ESP8266-12
It works as a standard WiFi 802.11 b / g / n 2.4 GHz
USB Communication - CP2102 Chip
Characteristic:
ESP 12E ESP8266 ESP12E NodeMcu Lua Wireless Development Board CP2102 WiFi features:

- Supply voltage: 3.3V (LOGICAL LEVELS: 3.3V)
- Supported protocols: 802.11 b / g / n
- Network support: 2.4 GHz
- Band: 2400 (MHz) - Wi-Fi Direct (P2p), Soft Access Point
- Integrated TCP / IP stack
- PLL, regulators and integrated power management units
- Output power: 0 , 15 (W); + 19.5dBm in 802.11b mode