10 lines of code and 3 wires later, I had a wonderful “Hello world” displayed on screen. The only problem is that I was using pin 1 (TX) which is shared with the serial USB interface. So when the sketch is uploaded, it’s also sent to the SerLCD. And you end up with garbage on screen. Hopefully, Arduino<\/a> comes with a soft serial class<\/a>. It lets you use custom pins for serial communication. The only downside it that it can only run at 4800 baud or 9600 baud. Here’s the result!<\/p>\n The mandatory piece of code.<\/p>\n Woohoo! I just got my hands on a 20×4 serial LCD from Sparkfun. It’s basically a standard LCD with a little PIC based serial TTL interface board plugged on it. 10 lines of code and 3 wires later, I had a wonderful “Hello world” displayed on screen. The only problem\u2026 Continue reading<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[7,3],"tags":[26],"_links":{"self":[{"href":"https:\/\/blog.blockos.org\/index.php?rest_route=\/wp\/v2\/posts\/32"}],"collection":[{"href":"https:\/\/blog.blockos.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.blockos.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.blockos.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.blockos.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=32"}],"version-history":[{"count":2,"href":"https:\/\/blog.blockos.org\/index.php?rest_route=\/wp\/v2\/posts\/32\/revisions"}],"predecessor-version":[{"id":129,"href":"https:\/\/blog.blockos.org\/index.php?rest_route=\/wp\/v2\/posts\/32\/revisions\/129"}],"wp:attachment":[{"href":"https:\/\/blog.blockos.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=32"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.blockos.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=32"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.blockos.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=32"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nNext serial fun : 4DSystem’s \u00b5DRIVE-uSD-G1<\/a>.<\/p>\n![\"Arduino+SerLCD](\"http:\/\/blockos.org\/mooz\/lcd01.jpg\")
<\/p>\n\r\n#include <softwareSerial.h>\r\n\r\n#define SERLCD_CMD 0xFE\r\n\r\n#define SERLCD_CLEAR 0x01\r\n#define SERLCD_MOVE1_R 0x14\r\n#define SERLCD_MOVE1_L 0x10\r\n#define SERLCD_SCROLL_R 0x1C\r\n#define SERLCD_SCROLL_L 0x18\r\n#define SERLCD_DISP_ON 0x0C\r\n#define SERLCD_DISP_OFF 0x08\r\n#define SERLCD_UNDERLINE_CURSOR_ON 0x0E\r\n#define SERLCD_UNDERLINE_CURSOR_OFF 0x0C\r\n#define SERLCD_BLINKING_CURSOR_ON 0x0D\r\n#define SERLCD_BLINKING_CURSOR_OFF 0x0C\r\n#define SERLCD_SET_CURSOR_POS 0x80\r\n#define SERLCD_CURSOR_OFF 0x0C\r\n\r\n\r\n#define rxPin 6\r\n#define txPin 7\r\n\r\nvoid setup()\r\n{\r\n char *str = "BlockoS! :)";\r\n char *cursor;\r\n\r\n SoftwareSerial mySerial = SoftwareSerial(rxPin, txPin);\r\n\r\n pinMode(rxPin, INPUT);\r\n pinMode(txPin, OUTPUT);\r\n\r\n mySerial.begin(9600);\r\n\r\n mySerial.print(SERLCD_CMD, BYTE);\r\n mySerial.print(SERLCD_CLEAR, BYTE);\r\n\r\n mySerial.print(SERLCD_CMD, BYTE);\r\n mySerial.print(SERLCD_BLINKING_CURSOR_ON, BYTE);\r\n\r\n for(cursor=str; *cursor!='\0'; ++cursor)\r\n {\r\n mySerial.print(*cursor, BYTE);\r\n }\r\n}\r\n\r\nvoid loop()\r\n{\r\n \/* Nothing *\/\r\n}<\/pre>\n","protected":false},"excerpt":{"rendered":"