Biometric sensor has Hugh application in security, attendance etc. We use R307 Fingerprint Module. R307 Fingerprint Module consists of optical fingerprint sensor, high-speed DSP processor. Fingerprint processing includes two parts: fingerprint enrollment and fingerprint matching (the matching can be 1:1 or 1:N). When enrolling, user needs to enter the finger two times. The system will […]
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In GSM networking topology SIM (Subscriber Identity Module) is the key. In this article we use sms (short message service) to control load. For SIM reading we use module SIM900A GSM module. First look the connection diagram- For transmission data the basic format is- Here, <CR> Carriage Return (‘\r’ or 0x0D) – moves the cursor
GPS stands for Global Positioning System and used to detect the Latitude and Longitude of any location on the earth, with exact UTC (Universe Time Coordinated) time. It is one of the global navigation satellite system (GSS) that provide geo-location and time information to a GPS receiver anywhere on or near the earth where is
To communication with PC or laptop with microcontroller, the popular protocol is UART. In PC or laptop we see serial port which has Tx and Rx pin. It is a 9 pin terminal which has the pin- For Asynchronous data transmission we need only 3 wire – Rx, Tx and Ground. The RTS and CTS
USART stands for Universal Synchronous Asynchronous Transmitter and Receiver in which a packet of data enclosed in an envelope of start and stop bit. Synchronous means that single clock source would be shared by end devices to facilitate communication and asynchronous means, there would be no synchronous clock source would be the end of the
OLED is an Organic Light Emitting Diodes. OLED is a flat emitting technology based screen. OLEDs are emissive display that does not require a backlight, so are thinner and more efficient and LCD display which require a white backlight. OLED display are not just thin and efficient, they provide the best image quality ever as
The DS1307 serial real time clock is a low power, full binary-coded decimal (BCD) clock/calendar plus 56bytes of NV SRAM. Address and data are transmitted serially via 2-wire, bi-directional bus. The clock/calendar provides seconds, minutes, hour, day, date, month and year information. The end date at the month date is automatically adjusted for months with
EEPROM stands for electricity erasable programmable read only memory and it is a type of non-volatile memory used in different application. It is read only memory whose data can be erase and re-programmed by higher than normal current of electricity. Many microcontrollers have in build EEPROM. In this article we use AT24C512 serial EEPROM. It
We already learn LCD interfacing in GPIO part. LCD Display requires lots of digital I/O pin and the circuit requires more space. In market I2C LCD display are available and the interfacing is not so difficult. You just need the hardware and the I2C IC which is connected with that LCD. Usually in maximum I2C
In SPI communication we use MCP23S17 with SPI transmission. In this article we use same IC MCP23017 with I2C transmission. Let’s look at the connection diagram. The I2C protocol for MCP23017 is as follow- Here the first 4 bits is the logical address and last 3 bits A2: A0 are the physical address. Since we
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