IPod nano Car Charger
According to the USB charging and power spec I should be able to simply short the two central pins (the data lines) and the device will detect that it's connected to a charging device and start charging.
I tried this first of all, but it didn't work (the iPod detected it had been plugged in to something, but refused to charge). I knew the iPod charged from my MintyBoost!, and after a quick look at the schematic and some playing with the multimeter, I decided it would be worthwhile adding a couple of pull-up resistors.
I don't think the values are that vital (the USB spec is quite forgiving), but I decided to try matching roughly what the MintyBoost! was giving, apart from the V+ to D- resistor, which was guesswork.
Don't forget to check that you've got the correct resistance between the pins, and that they're not connected to anything they shouldn't be!
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Cellet Apple Licensed (MFI Certified) 30 Pin Retractable Car Charger Tangle-Free Portable for Apple iPhone 3/3GS/4/4S, iPod Touch, Nano, iPad, iPod Classic Wireless (Cellet)
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Car Charger, Nexcon Apple MFi Certified 3.4A Lightning Car Charger with 3.3ft Integrated Built-in Apple 8-Pin Cable for iPhone 7/ 7 Plus 6s / 6/ Plus SE iPad Pro Air 2 mini 4/3 iPod 5 iPod Nano, Black Wireless (Nekteck)
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iFlash® Dual USB Port Car Charger for Apple iPhone 6 Plus / 6 / 5S / 5C / 5 / 4S, iPod Touch 4th / 5th Generation, iPod Nano 4th / 5th / 6th / 7th Generation, Samsung Galaxy S6 Edge / S6 / S5 / S5 / S4 / S3 / S2 / S / Mini; Samsung Galaxy Note 2 / 3 / 4 (Black Color, 5V/2A high speed charger) Wireless (iFlash)
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[Apple Certified] ACEPower 4 Feet (1.2M) 30 pin USB Sync and Charging Cable for iPhone 4 / 4S, iPhone 3G / 3GS, iPad 1 / 2 / 3, iPod nano 5th / 6th generations and iPod Touch 3rd / 4th generations, White (Retail Packaging) Wireless (ACEPower)
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iPhone Car Charger, Shackle High Speed Travel Adapter with Extra Long Built-in Lightning Connector for iPhone 7 6S Plus 6 Plus 6 Se 5S 5 5C iPad Pro Air Mini 2 3 4 and Extra USB Port for Android Wireless (SHACKLE)
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