arduino, weighing scales, digital IO LCD readout, simple program money paid

I have developed an apparatus designed to fill cylinders to a specific and user variable level. the container sits on weighing scales with rs232 bi-directional serial port, definition available. the user would use push buttons to set the desired weight, arduino will set the scales to tare, open solenoid actuated valve, water flows when the weight reaches the desired level closes valve, cylinder is filled accurately every time.

Later development for pre-sets and so forth.

My engineering and electronic skills are excellent and collaboration will be fluent but I do not have the programming experience or the time to learn right now.

any interest should be serious only as this is a paid job with well defined parameters. Thanks charlie

How would you want interested parties to contact you?

How many switches? What scales? What specific LCD? What accuracy? +/- 5 pounds or +/- .5 grams?

thanks for your reply, the weighing scales intended to be used: their accuracy is adequate. Using a switch wired direct to the solenoid valve I would calculate the lag time and in any case the accuracy of the fill should be +- 10g /10ml but one should remember that this apparatus is replacing manually controlled garden hose with the cylinder hanging on scales.

LCD display picked out of so many "20x4 Arduino LCD display HD44780 Blue LED Backlight" this would fit the bill as there are so many available for up to £24 the easier to develop with the better.

buttons: up, down, left, right, select, start, on/off power switch.

The most basic way for this to work is to set the target weight then press start to fill the cylinder. We could add a safety feature if no cylinder is in place but this could simply be a contact closure in series with the valve solenoid.

I would like to have the current weight shown on the display as the cylinder fills.

The most advanced development would be as follows, as different cylinders require differing quantities of water i would like to be able to select from a list of named cylinders ie, the model and type, the required weight is preset and ready to go. I would like this feature to be configurable using a menu system displayed on the LCD.

Also in the menu system could be a trim function for lag between shut of and actual end weight.

It would be great if you programmers could offer some feedback as to the complexity of the project. if you are interested in being involved and you feel that you could follow the project through completely please private message.

A full and complete specification will be settled upon with the developer prior to commencement of the contract.

you have a PM (in case they're not getting through!)

looks like they're still ever so slightly broken

you can email me though
email address in my profile
shame you don't have one in yours!


one does wonder what happened?
are you able to give any clues?