Ford Prefect

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  1. Both for more than $10 seems to be the way to go
  2. The last number indicates the number of zeroes to add to get the value in picofarads so: 101 means 100 pF 104 means 0.1µF or 100000 pF
  3. Hi There seems to be a ground connection missing here is the schematic from OrangePI PC
  4. Hi This is the error I get E: fexc-bin: Malformed data: version 34984.1.2. Still working in a saved bin.old folder
  5. Hi here it is: Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 002: ID 0e8f:2517 GreenAsia Inc. Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 003: ID 0bda:8153 Realtek Semiconductor Corp. Bus 004 Device 002: ID 05e3:0610 Genesys Logic, Inc. 4-port hub Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 002: ID 148f:2573 Ralink Technology, Corp. RT2501/RT2573 Wireless Adapter Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 0ccd:0097 TerraTec Electronic GmbH Cinergy T RC MKII Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub It is seen as Realtek I believe "Green Asia" is my wireless keyboard dongle bilou@orangepipc:~$ sudo ifconfig eth0 Link encap:Ethernet HWaddr 7e:c3:14:57:e7:b1 inet addr:192.168.1.95 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::7cc3:14ff:fe57:e7b1/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:4217 errors:0 dropped:0 overruns:0 frame:0 TX packets:3219 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1010982 (987.2 KiB) TX bytes:374340 (365.5 KiB) Interrupt:114 eth1 Link encap:Ethernet HWaddr 00:e0:4c:68:13:06 inet6 addr: fe80::2e0:4cff:fe68:1306/64 Scope:Link UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:1 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 TX bytes:90 (90.0 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:4 errors:0 dropped:0 overruns:0 frame:0 TX packets:4 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:200 (200.0 TX bytes:200 (200.0 here is the tail of dmesg when connecting the device [ 300.469091] ehci_irq: highspeed device connect [ 300.730076] usb 4-1: new high-speed USB device number 2 using sunxi-ehci [ 300.883751] hub 4-1:1.0: USB hub found [ 300.884323] hub 4-1:1.0: 4 ports detected [ 301.160120] usb 4-1.1: new high-speed USB device number 3 using sunxi-ehci [ 301.307001] cdc_ether 4-1.1:2.0: eth1: register 'cdc_ether' at usb-sunxi-ehci -1.1, CDC Ethernet Device, 00:e0:4c:68:13:06 [ 301.307544] usbcore: registered new interface driver cdc_ether b
  6. Hi Nice Box for sure. Main problem with such a solution is that when you want access to the hardware on a bench you have to use a temporary heat sink. I killed a DVD writer this way. Only later I noticed there was a thermal pad on the cover I removed
  7. Beware of the USB3 hub Ethernet combo. I tried one with very poor Ethernet performance. Hub seems OK but doesn't allow for external power supply.
  8. In my opinion it is much better to have the CPU on the solder side of the board. It allows efficient passive cooling in a metal box that can be necessary for EMC in the real world.
  9. research

    Hi The channel used in the 2.4 GHz band is important. High speed WIFI modes are normally impossible on channels close to the band borders like 1 or 13 because the spectrum of the signal would be out of band. Depending on the drivers used on both sides this can lead to errors of interpretation.
  10. Hi Does this means that it could be possible to change the use of the GPIO pins "on the fly" I mean without rebooting.
  11. Adding or improving passive cooling on any SBC is ALWAYS a good idea. It doesn't requires any technical knowledge. It can save you a lot of time.
  12. I have no experience of recent cheap WIFI dongles . An important point IMHO is to choose one that allows Access point and Blue Tooth operation. Using a long USB cable can also improve greatly their performance by placing them in a place where interference is low.
  13. Hi Using gqrx to decode FM stereo i found that it sometimes took about 1 minute to get a decent audio. It is a very CPU intensive process. During that time the CPU frequency varied a lot before stabilizing to maximum. This problem disappeared by switching to performance mode. May be it would be a good idea to do that for testing WLAN performance too. There are cases of interference caused by USB3 may be the CPU clock can interfere too. Is there a command that can fix the CPU frequency on the fly ?
  14. OK no problem . In fact as the new MAC address was already in my DHCP it means that at least another distribution uses the same way to choose it.
  15. I believe that the real impedance of the chip input is very high. Thus the .1 µF cap doesn't cause low frequency loss and seen from the microphone connexions it is the bias resistors that determine the impedance. Those electret mikes are of low impedance because of the incorporated amplifiers. Here is the schematic I have: