6 ms·
No networking it looks like. Whenever I see these dev boards (and I have dozens), I'm always tempted to just use a cell phone. Does your project need networki
by snarfy 8y ago
No networking it looks like.
Whenever I see these dev boards (and I have dozens), I'm always tempted to just use a cell phone.
Does your project need networking? A battery? A display? Bluetooth? Try cobbling together an arduino like solution and you'll spend > $50. You can buy a smartphone with wifi and touchscreen running android for $10.
- IloveHN84 8y agoNot everyone is looking for network, so it's perfectly fine. Plus, how would you use a phone which has restrictions from OEM?
- dorfsmay 8y ago10$ new or used? With easy to change batteries?
- snarfy 8y agoNo idea if I can change the batteries, but for $10 don't really care. https://www.amazon.com/Net10-Alcatel-Star-Prepaid-Smartphone/dp/B07FK6KDQF https://www.amazon.com/Net10-Alcatel-Star-Prepaid-Smartphone...
- avar 8y agoWhere can you buy a smartphone with wifi and a touchscreen for $10? If the answer is "used", then I could also buy something like this $6 board used for $0.06 in a few years, so that doesn't count.
- jsjohnst 8y agoAlibaba is probably the easiest for folks wanting new for that price point, but I routinely see devices at that price point when visiting electronics markets in HK, Seoul, and Shenzhen. Amazon has devices sub $30 new.
- morganvachon 8y agoWalmart and Target in the US sometimes have closeout sales on their $30 prepaid smartphones that brings them down to the $10 range. They are a huge loss leader even at $30 because they expect you to sign up and pay for at least a few months' service.
- oneplane 8y agoDoes the phone have open source drivers and firmware so you can run and do whatever you want? Not everyone is running 'apps'...
- yjftsjthsd-h 8y agoIt's not 100% coverage, but Android + Termux covers 99% of cases I can imagine. But keep in mind I'm mostly interested in using these things as tiny web servers.
- cs2818 8y agoAny good solutions for getting GPIO, I2C, SPI on a phone?
- rutierut 8y agoOn some the volume buttons can be used as GPIO
- Jaruzel 8y agoYou can get USB based GPIO boards for ~$20. Some need drivers, some emulate serial. I'm guessing that with a USB-to-go cable, you could connect these to the phone.
- imtringued 8y agoThen you're back to $30 and can just buy an ESP32 with a screen module but suffer from the indeterministic USB stack. However you could also buy a $6 ESP32 and let it communicate with the smartphone over blue-tooth at a price point of $10 (phone) + $6 (ESP32).
- Jaruzel 8y agoAgreed. There are many ways to skin this particular cat. It all depends on your use-case.
- NullPrefix 8y agoYou can use ESP chip and make it talk GPIO/I2C/SPI while communicating with your phone over WiFi.
- singularity2001 8y agoOr use ESP chip and make it talk via USB serial (android host mode adapter < $5). Much superior to RPi+shitty screen. But rooting can be a PITA if java@android isn't enough for you.
- imtringued 8y agoWell it entirely depends on what you want to do. As soon as you need GPIO, ADC, PWM, I2C or SPI a smartphone isn't going to work. But I will admit that an arduino + throwaway smartphone combination could solve a wide variety of problems.
- beagle3 8y agoAs long as these phones have a 3.5’ headphone jack, you have 1 channel 8-20 kHz ADC and two channel 8-48 kHZ DAC. That’s not I2C or SPI but it is helpful and useful for many applications. The people at Square (payment app) can tell you all about it.
- markrages 8y agoAudio DAC and ADC do not measure or output DC, which makes them useless for many applications.
- jayalpha 8y ago"下图中，U盘旁还插着一根USB有线网卡+HUB (RT8152B), 它的上面还插着 mt7601u USB-WIFI，这样就扩展出一个有线网络 eth0 和一个无线网络 wlan0." Not 100% sure about the meaning since I don't see a eth0 in the pic above. The Chinese text refers to the pic "below" but I still don't get it.
- ttflee 8y agoThe text could be translated as: Shown in the picture below, a USB-ethernet adapter/HUB (RT8152B), where a mt7601u USB-WiFi was plugged in, was plugged in besides the USB thumb drive. Thus it is expanded with a wired eth0 and a wireless wlan0. I guess what you did not see is the ethernet adapter port like this: https://www.amazon.com/Anker-Portable-Ethernet-Network-Notebooks/dp/B014ZOJX7W https://www.amazon.com/Anker-Portable-Ethernet-Network-Noteb...
- tyingq 8y agoIt looks like this one: https://www.aliexpress.com/item/EDUP-USB-Gigabit-Ethernet-Adapter-10-100-1000Mbps-USB-Hub-3-0-Lan-Wired-Network-Card/32848505617.html https://www.aliexpress.com/item/EDUP-USB-Gigabit-Ethernet-Ad...
- deleted 8y ago[deleted]
- fest 8y agoFrom my experience: even when you have full Android sources for the device (vendor blobs for camera/modem notwithstanding) it is PITA to do something out of the ordinary. Want to enable hotspot on boot? Few dozen lines in Java or a shell script sending keyboard commands to open the particular settings page and enter to toggle the setting. Want simultaneous wifi client and modem? Good luck fighting with connection manager service automatically setting up routes. Use UART? Better hope that guys configuring the clock tree have explicitly made sure the UART clock is gated, instead of UART receiving the clock from something else by accident.