Common standards: RS232 RS422 RS449 RS485 20 mA current loop Serial data transmission standards including RS232, RS422, RS423, and RS485 were widely used for many data links, proving effective connectivity for the day. Serial data communications standards - RS-232, RS-422, & RS-485 were widely used for data transfer providing easy connectivity for the time and they can still be found today. Barrel jack or screw terminal options for providing coil power & LED. L LED if you don't want a light. Youtube videos showing high current (700mA C6060 LED module) being controlled. RS485 RS-485 is a standard that allows high speed data transmission along with multiple transmitters and receivers and this makes it able to be incorporated as a network solution. The foreword to the standard references The Telecommunications Systems Bulletin TSB-89 which contains application guidelines, including data signaling rate vs. Electrical signaling is balanced, and multipoint systems are supported. Assembled cards are $21.50 and ship flat rate boxes. Larger quantities will ship in a flat rate box. Kits are $16.50 each, and ship in a padded envelope. All headers are on a 0.1" grid to allow accessory proto-boards to span multiple connectors if needed. The power input connector can be a coaxial barrel connector, a 2-pin terminal block, or a MTA-100 connector or 0.1" spacing header.

All the interfaces are brought out to various connectors to easily hook up to accessory boards and peripheral ICs. Various build options are possible including 4-wire serial, 1x10-pin female ComBoard header, or a 2x5-pin shrouded header for use with ribbon cables. ICSP Header, DTR enable jumper, FTDI header with 5V enable jumper. The ICSP header will support ICSP connectors from other shields. Builds on the original Bobuino, makes USB/Serial easier to assemble, adds lots of connection options besides just shields - signal/power/ground available at each pin location. The board is a little bigger in length now, 77mm across by 73mm, has each header pins brought out to a 3.5mm pitch screw terminal, and to a pin in the 12x20 protoboard area. The AVR1284-3U is a development board for 40 pin AVR microcontrollers. The thru hole transistors went obsolete, so the board has been converted to all SMD except for the 74HC595s and the screw terminals. Similar to Original Bobuino; ATMega1284, RS232 port, FTDI FT232RL USB, SD Card Socket, Screw terminals for 4 serial ports, power, 2 input buttons, 3 switch closures, additional SPI-Dual UART with RS485 interface drivers, 3 additional Status LEDs, Arduino shield compatible. Don't forget our Book, Arduino for Teens.

This standard was known as V.24 and is totally compatible with RS-232. RS232 RS-232 is the most widely used serial standard that is in use. The first of the RS standards was RS232, or more correctly RS-232. Once RS-232 was established an equivalent standard was written for the ITU (International Telecommunications Union) to provide a more international standard. Converters between RS-485 and RS-232 are available to allow a personal computer to communicate with remote devices. Inputs are daisychained to a second set of contacts for easy daisychaining. 3 boards daisychained. Connect signals from 1st to 2nd to 3rd, add power & Gnd to each. Programming an Uno under battery power. Connect up a power source (3xAA battery pack, 5VDC wallwart, 7-12VDC wallwart or non-running vehicle power), dial in the program to download and press the Start button. SD card with 74HC4050 SPI buffering, MAX3232 for RS232 on Serial 2, battery bacled DS1307 with 32.786 KHz crystal. I used male-female terminated wires & crimp housings to make this little jumper cable to drive the board with SPI transfers. Kits for board as pictured with all headers, $13.50 to US addresses, rs485 cable includes padded envelope shipping via USPS & paypal fee. Kits available for $76.

Kits less the MIKROE-483 USB module $27. Kits $50. Assembled boards $105. Assembled boards available for $25. Bare Boards $5. Kits, $27. It can be plugged into microcontroller dev boards with ComBoard serial port headers allow the serial port type to be easily changed. All boards include a Sandisk 4GB SD card and 6 inch/15cm programming cable. New "mini" card types, Mini 2560 & Mini 2561! We're assembling 2560 cards now, all IO pins broken out. Out and other MAX7219 libraries will also work. The USA Swimming branding logo will be removed or replaced by your organization logo. Mini 2561 will be posted soon, we're waiting on stencil delivery to put one together. Now you don't need one! 32 P-channel MOSFET board with screw terminals - when you need to Source current vs sink current. 32 channel N-MOSFET board. Board size is 130x77mm, overlapping the Mega board edges. Mega shield, relays driver by D22-D29. 12-digit, or 96 Bit, LED driver.