The project is that I have a box with objects in it. Each object has a placeholder within the box. I want to place a sensor in the bottom of each placeholder and have it tell me if an object is within the placholder or not. With RFID i want to know what is missing without opening the box.
Looking for a sensor that is small (size of quarter), uses passive rfid technology and will tell me if something is touching it. Possibly just store a binary value if something is touching it or not. Looking to be able to stick the sensor ina location and know if an object is touching it. The read range can be short or long. What type of tag would I be looking for? Willing to discuss the option to have it created for a fee.
Love to hear the groups thoughts
I guess it would make more sense if I explained the complete use case.
I have a plant store. Within the store I have 30 cabinets. The cabinets hold trays of plants. The plant trays differ in size and they slide in and out of the cabinets. There are 50 slots within the cabinet. A tray can slide within each cabinet at any of those slots. I want to place a sensor on one of the trays and when i move it in and out of the cabinet it will update my database and let me know where it is. The trays will be constantly moving from cabinet to cabinet depending on where the plant is in its growth cycle.
Once I am able to determine the distance the tray is from the reader on the cabinet I can associate the distance to match the number labeling system on the cabinet so i will know exactly what slot the tray is in.
Automation is the complete goal.
That is goal. I want to place a 'tag' on each device that goes into the cabinet. Not only do i want to know the object is within the cabinet but i need to know where its mounted within the cabinet. When the cabinet is scanned for objects it would return what objects are in the cabinet and their location on the Y axis only. Im only concerned about the objects height within the cabinet.
The goal would be to have hardware on the cabinet that would be able to inventory all objects within the rack. I think ultrasonic would not be applicable in my scenario.
With ultrasound, will there be issues with the pulse traveling through other objects within the cabinet until the pulse hits the tag?
With the max distance a signal would travel being 8ft, would the continuous wave method work?
The basic idea is this...
I will have multiple cabinets next to each other in a room. Each cabinet will have a sensor located at the top. Within the cabinet will be multiple other sensors at different heights located on shelves. I want the sensor at the top of the rack to be able to locate all sensors within its own cabinet and also determine the height of each sensor.
Im not concerned about its exact position in the cabinet, only its height. I figured it would be easier to accomplish this by placing a sensor at each cabinet instead of using triangulation with a few sensors within the whole room. This could also help make the margin or error smaller, hopefully down to half an inch.
What do you think would be the best way to measure the distance to determine the placement of the sensors height (Y axis)?
@tbowmo Maybe i missed it but do you have an image with the si7021 attached to the radio and pcb?
I apologize for the questions and how simple they may be, as Im new to this community but very intrigued with the creativity and endless possibilities.