hi thank you for replys and i will answer some now. i use the 3.3v as recommended but have noticed that my original arduino gives 3.3v but rises to 4v with the sensor sda/scl connected. the clone ones are somwhat higher at over 4volts but less as its loaded. i have 4 of these from the same supplier and cannot say ive had any problems with them. they work ever time every time with the ide examples. while ime waiting for the chinese sensors i leave the board display etc in its semi working condition and assemble another to try and fix the problems. as they are cheap enough. one nokia 5110 was a bit suspect but squeezing the metal frame cleaned up the contacts inside so its ok now. i will take your advice on sending you the error codes i am getting and the site the sketches come from .it only takes a minit to wire one up and as ime retired i have plenty of time. my gps one works well apart from the bmp sensor and i took it out on a bus ride and watched with interest as the altitude asl changed and the lat/long. when my nano comes i can work on that with out disturbing the boxed version the pressure in 4 digit millibars (ie 1026mb) only shows 2mb when there should be 4 numbers or maybe as theres no input it defaults to that. arduino seems to be a vast thing with lots of followers and multiple ways of doing the same thing. i hope to work thro the examples, especially the lcd i2c and non i2c as that would help my understanding at present. i did the i2c bus scanner for the bmp/e280 and it came up 0x76 and followed exactly a project for a weather station, i looked as he did(on youtube) to change the 0x77 to 76 but my sketch using the exact same as i thought his download as he had didnt show the address where it did on his so i added it in and i think it moved the verify/compile on a bit to the next problem.. i keep waiting for the buzz when it verifies/compiles/uploads and works rather than just blank. ime not giving up yet as ive want these useful projects many thanks