Any elegant way, avoiding pulldowns, to avoid this nuisance?
Hi,Have you got the gnds of the two controllers connected?What model Arduinos are you using?Thanks.. Tom..
Hello, i have a master board sending commands to a slave board via serial 2. When master is loaded with new code, slave receives plenty of nonsense. Any elegant way, avoiding pulldowns, to avoid this nuisance? Thanks
Hi,Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?Thanks.. Tom..
You may try using a GPIO from the master connected to the slave as a ValidMasterSignal and monitor that signal, at the slave end, for MasterIsValid and from there do the blah and blah and blah thing.
Thank YOU Tom, Both are mega board sitting by solderless cards, both (mega and solderless) mounted on a plastic support platform from sparkfunYes the two board's grounds are connected.Again, issue is while master is undergoing code download. In this situation, there is noise AND outputs (master Tx) are (i think) threestated.
Tx & Rx cannot be used for interfacing while code is being downloaded because those pins are used for code download. You need to remove the connections to Tx and Rx before downloading code and then you can reconnect them after the code is downloaded.Post your code so we can see what lines you are using .