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Dear github user, I created this project to keep track how much milk my daughter was consuming. The hope is to build a bunch of small sensors out of flex pcb and stick them on to the side of Medela milk bottles.

I searched for cheap BLE enabled MCU's and I found that the PSoC4 was a good match as it also has capsense which will make sensing quite cheap and simple.

So far this project is based on a couple of shields from Cypress plugged into each other:

You'll need to remove R47 on CY8CKIT-042-BLE as it's hooked up to some USB to i2c converter thingy (and this hurts the capsense signal)

Use cases:

  • Milk in to bank
  • Milk out of bank
  • Total milk in bank
  • Discarding milk
  • Freezing of milk
  • Temperature of Milk
  • Multiple banks
  • Allow bottles to be washed without getting false readings
  • Time and duration of feeding?
  • Naming of each bottle

Ideas:

  • Recharge with solar panel
  • Run off a super capacitor rather then using a coin cell

Problems:

  • If the flex pcb is a sticker on the bottle, how do you wash the bottle?
  • Will an alkaline coin cell suck in the fridge? How about the freezer?
  • Can Bluetooth get through a fridge door?
  • How can bottles be named?

Things I broke:

  • CapSense_Sleep and CapSense_Wakeup. The manual (used for detecting liquid level) version of CapSense doesn't appear to have these functions.
  • Low power mode. I disabled the ENABLE_LOW_POWER_MODE flag because UART and CapSense were not being respected before going to sleep

Ok bye, Richard

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