Yo Oliver! On Thu, 2 Jun 2016 12:00:07 +0100 Oliver Jowett <[email protected]> wrote:
> On 2 June 2016 at 11:25, Hal Murray <[email protected]> wrote: > > > > I just swapped the 701 on a Pi-3 with a 601 on a Pi-2. > > > > That didn't take long. The 601 just hung on the Pi-3. I have had no issues with a GR-601W on my Gentoo/Pi3 > Do you trust your power? The Pi 3 is even more picky than the Pi 2. The Pi people say 2 amps is not good enough, they recommend 2.5A. I have a USB Volt/Amp meter on my Pi3, never seen it pull more than 700 mA while compiling a kernel, and running gpsd, ntpd and the GR-601W. But no keyboard, mouse or HAT. Soon to have a HAT. Unless your USB cable is real short (1 foot, or less) you also need 20AWG USB cables. 700mA can cause a large voltage drop on a thin USB cable There are a lot of really bad USB cables on the market. 28AWG is 0.064 ohms per foot. Double that for out and back to 0.128 ohms/ft of USB cable. Anecdotally, the Pi3 need 4.8V minimum to run. That means with a stiff power supply your USB 28AWG can be no longer than 2 feet. Shorter with a mouse, keyboard, etc. Everyone should have a USB V/A meter, they are cheap. Here is one for $6: http://www.newegg.com/Product/Product.aspx?Item=9SIAASP40K5443&cm_re=usb_voltmeter-_-0AF-001N-000C6-_-Product One that computes Watts and WattHours is under $9: http://www.newegg.com/Product/Product.aspx?Item=9SIA7BF34D5523&cm_re=usb_voltmeter-_-9SIA7BF34D5523-_-Product Just be sure your meter can do 9V for the new Quick Charge standard. RGDS GARY --------------------------------------------------------------------------- Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703 [email protected] Tel:+1 541 382 8588
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