Swift on Raspberry Pi
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From Southend Raspberry Jam - 8th of March 2020. A talk showing how to make a smart coin bank using Swift on a Raspberry Pi, including using an LCD component, working with Load Cells, and Bit Banging.
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Swift on Raspberry Pi
- 2. @mostgood 👋 Sally Student: MSc Internet of Things Also: iOS developer and Technical Writer
- 3. @mostgood
- 8. 🍎 📱⌚🖥 Open source programming langage
- 9. Safe. Code should behave in a safe manner. Undefined behaviour is the enemy of safety, and developer mistakes should be caught before software is in production. Fast. Swift is intended as a replacement for C-based languages (C, C++, and Objective-C). As such, Swift must be comparable to those languages in performance for most tasks. Expressive. Swift benefits from decades of advancement in computer science to offer syntax that is a joy to use, with modern features developers expect.
- 10. Together we are working to build a programming language to empower everyone to turn their ideas into apps on any platform. https://swift.org/
- 11. First Local Cat Savings Bank! @mostgood Introducing…
- 12. Video of coin bank Our ‘Savings Account’ product Real product* *not made by us
- 13. I want to know how much I just deposited I want to know how much is in my savings account I want to access information about my savings account from my phone Customer feedback for ‘Savings Account’
- 14. Introducing our new product: Smart Deposit Platform
- 20. What’s under the hood? @mostgood
- 22. Smart Deposit Platform • Counts money as it is deposited • Sends deposit information to the server Hardware
- 23. Cloud Maintains customers account • Deposit information • Account overview
- 30. curl -s https://packagecloud.io/install/repositories/ swift-arm/release/script.deb.sh | sudo bash sudo apt install ________ (version of Swift check: https://packagecloud.io/swift-arm/ release) For more info: https://swift-arm.com Install Swift on the Raspberry Pi
- 31. @mostgood mkdir ~/Documents/<project-name> cd ~/Documents/<project-name> swift package init --type executable swift package init --type executable Creating executable package: FirstLocalCatSavingsBank Creating Package.swift Creating README.md Creating .gitignore Creating Sources/ Creating Sources/FirstLocalCatSavingsBank/main.swift Creating Tests/ Creating Tests/LinuxMain.swift Creating Tests/FirstLocalCatSavingsBankTests/ Creating Tests/FirstLocalCatSavingsBankTests/FirstLocalCatSavingsBankTests.swift Creating Tests/FirstLocalCatSavingsBankTests/XCTestManifests.swift Create a new project
- 32. Dependencies -> dependencies: [ // Dependencies declare other packages that this package depends on. .package(url: "https://github.com/uraimo/SwiftyGPIO.git", from: "1.0.0")] .target( name: "FirstLocalCatSavingsBank", dependencies: ["SwiftyGPIO"]) Reference: https://github.com/uraimo/SwiftyGPIO @mostgood
- 33. Reference: https://github.com/uraimo/SwiftyGPIO @mostgood Basically, ARMv7/8+Ubuntu/Debian/Raspbian or an ARMv6+Raspbian/Debian should work • Raspberry Pi 3, 3B+, 2, Zero, Zero W, Classic A,B,A+,B+ Rev1/Rev2 • BeagleBones • OrangePi, OrangePi Zero • Asus Tinkerboard • C.H.I.P. • BananaPi M1/2/3
- 34. Showing the deposit status
- 37. import SwiftyGPIO import HD44780LCD let gpios = SwiftyGPIO.GPIOs(for:.RaspberryPiPlusZero) var rs = gpios[.P2]! var e = gpios[.P3]! var d4 = gpios[.P4]! var d5 = gpios[.P17]! var d6 = gpios[.P27]! var d7 = gpios[.P22]! let lcd = HD44780LCD(rs:rs, e:e, d7:d7, d6:d6, d5:d5, d4:d4, width:16, height:2) lcd.clearScreen() lcd.cursorHome() lcd.printString(x:0, y:0, what:"Deposited: (depositValue)”, usCharSet:true)
- 38. What coin is the customer depositing? @mostgood
- 39. @mostgood Smart Deposit Platform Savings Account 💰 How do we find the value of this? Each coin has a unique weight
- 41. @mostgood 💰 current ‘Savings Account’ weight previous ‘Savings Account’ weight = - 💰 1003.5g 994g= -
- 42. @mostgood 💰 current ‘Savings Account’ weight previous ‘Savings Account’ weight = - 💰 1003.5g 994g= - 💰 9.5g= = £1
- 43. How do we weigh something?
- 44. @mostgood
- 45. Load Cell
- 48. @mostgood HX711
- 50. @mostgood
- 51. @mostgood
- 52. @mostgood
- 53. Digital Signal 0 1 1 = 3.3v 1 = 3.3v 0 = 0v 0 = 0v @mostgood
- 56. Analogue to Digital? 140 768 0000 1000 1100 0011 0000 0000 @mostgood
- 57. Analogue to Digital? 0000 1000 1100 0011 0000 0000 @mostgood
- 58. Analogue to Digital? 0 0 0 0 0 0 1 0 1 0 0 1 word length = 12 bits @mostgood
- 59. @mostgood
- 60. @mostgood
- 61. @mostgood
- 62. @mostgood
- 64. // Setup individual pins for 'dt' (data) and 'sck' (serial clock) var dt = gpios[.P5]! var sck = gpios[.P6]! dt.direction = .IN sck.direction = .OUT
- 65. func read() -> Int32 { sck.value = 0 // read first 24 bits of data var dataIn: UInt32 = 0 for _ in 0..<24 { sck.value = 1 // Shift the bits as they come to dataIn variable. // Left shift by one bit then bitwise OR with the new bit. dataIn = (dataIn << 1) | UInt32(dt.value) sck.value = 0 } // check if data is valid // 0x7fffff is max value, 0x800000 is min value if (dataIn == 0x7fffff || dataIn == 0x800000) { print("Invalid data detected: (dataIn)") return 0 } // calculate int from 2's complement var signedData: Int32 = 0 if (Int32(dataIn & 0x800000) == 1) { // convert from 2's complement to int signedData = Int32(((dataIn ^ 0xffffff) + 1)) } else { // else do not do anything the value is positive number signedData = Int32(dataIn) } print("Converted 2's complement value: (signedData)") return Int32(signedData) }
- 66. £ g 2.00 12 1.00 9.5 0.50 8 0.20 5 0.10 6.5 0.05 3.25 0.02 7.12 0.01 3.56 switch coinWeight { case 3.15...3.35: // 5p coin depositValue = 0.05 break case 3.4...3.6: // 1p coin depositValue = 0.01 break case 4.9...5.1: // 20p coin depositValue = 0.2 break case 6.4...6.6: // 10p coin depositValue = 0.1 break case 7.02...7.22: // 2p coin depositValue = 0.2 break case 7.9...8.1: // 50p coin depositValue = 0.5 break case 9.4...9.6: // £1 coin depositValue = 1.0 break case 11.9...12.1: // £2 coin depositValue = 2.0 break default: print("Value not within a range of a predefined coin value") } Coin Value and weight
- 67. struct DepositEntry: Codable { var id: String? var value: Float var accountWeight: Float var date: Date init?(id: String?, value: Float, accountWeight: Float, date: Date) { if value.isEmpty { return nil } self.id = id self.value = value self.accountWeight = accountWeight self.date = date } }
- 70. Try Swift out :)