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  • Raspberry PI USB vs SERIAL communication with gsm shield (itbrainpower.net a-gsm shield)

    Hello,We must take into account the fact that the gsm shield consumption it is dependent on the network condition (signal/band) and to the usage mode (Searching/Registration/Registered/Calling/Voice-including the RX volume/DTMF/SMS/DATA).... sometimes, may happen to need more current than RPI3 module can provide from 5V pin. In order to be on the safe side, I recommend to power RPI3/2/any other Linux board and the a-gsm in STAR/parallel mode. Alternatives:a. use our c-uGSM / h-nanoGSM or d-u3G modular shields (all having USB/serial connection capabilities) in Lithium Polymer/super-capacitor configuration instead the a-gsm module. You can see how to connect them with RPI3 in our how to/projects area: http://itbrainpower.net/a-gsm/gsm-shield-Arduino-R...b. You may check by soldering o...see more »Hello,We must take into account the fact that the gsm shield consumption it is dependent on the network condition (signal/band) and to the usage mode (Searching/Registration/Registered/Calling/Voice-including the RX volume/DTMF/SMS/DATA).... sometimes, may happen to need more current than RPI3 module can provide from 5V pin. In order to be on the safe side, I recommend to power RPI3/2/any other Linux board and the a-gsm in STAR/parallel mode. Alternatives:a. use our c-uGSM / h-nanoGSM or d-u3G modular shields (all having USB/serial connection capabilities) in Lithium Polymer/super-capacitor configuration instead the a-gsm module. You can see how to connect them with RPI3 in our how to/projects area: http://itbrainpower.net/a-gsm/gsm-shield-Arduino-R...b. You may check by soldering one >4700-1000uF/ >5V or one super-capacitor / 5V bw. GND and modem's 4V supply. Avoiding the pulse consumption in this way, the RPI and the modem can run on the safe side.Dragos

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  • RASPBERRY PI FREE STYLE POWERING (RPI POWER SUPPLY HACK)

    Hi Blue_Prairie,First, I thank you for your time spent for reading my instructable. Anyway, I just mention: "THIS POWERING CONFIGURATION BYPASS THE RPI BUILT IN POWERING PROTECTION!" I did not say g-SPS has no protection.;)You will be surprised to find, but this implementation it really works! I have tens of RPI3 deployed powered via g-SPS 5V version (in production environment, running IoT application, some of them having embedded 2G modem using the same g-SPS 5V power supply).. This g-SPS 5V version power supply has more current capabilities as specified. Also, you will be surprised to find about the place where you can add a electrolytic capacitor (Eg.: 1000-2200uF/6.3V as is implemented in the g-SPS 4V version), in order to increase the pulse current capability. Also, as ...see more »Hi Blue_Prairie,First, I thank you for your time spent for reading my instructable. Anyway, I just mention: "THIS POWERING CONFIGURATION BYPASS THE RPI BUILT IN POWERING PROTECTION!" I did not say g-SPS has no protection.;)You will be surprised to find, but this implementation it really works! I have tens of RPI3 deployed powered via g-SPS 5V version (in production environment, running IoT application, some of them having embedded 2G modem using the same g-SPS 5V power supply).. This g-SPS 5V version power supply has more current capabilities as specified. Also, you will be surprised to find about the place where you can add a electrolytic capacitor (Eg.: 1000-2200uF/6.3V as is implemented in the g-SPS 4V version), in order to increase the pulse current capability. Also, as more convenient implementation, you can use the g-SPS 5V board in conjunction with i-hatGSM3G adapted board, as described bellow:http://itbrainpower.net/a-gsm/i-hatGSM3G_d-u3G_c-u...Your definitely must test it! :)Regards,Dragos

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  • Raspberry PI USB vs SERIAL communication with gsm shield (itbrainpower.net a-gsm shield)

    Hi Fatih,The a-gsm shield it is 2G (GSM) only. If you need 3G communication, you can use our d-u3G modular modem. d-u3G has very same SERIAL and USB connectivity support for Raspberry PI (including Raspberry PI3) and other ARM Linux boards.More information about d-u3G shield, other modular shields and associated accessories/adapters can be found on our site (check the how to and project area, also).Kind regards,Dragos

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  • RASPBERRY PI FREE STYLE POWERING (RPI POWER SUPPLY HACK)

    Hi Rick,Not all power supplies can be used with Raspberry Pi. All version of RPi needs a stable power source with supplying voltage a little bit more than 5V (around 5.15V -> 5.25V), and current up to 1-1.5A. g-SPS 5V version fulfill those criteria. More of that, replicating this instructable, you can replace the standard way of powering Raspberry Pi (via USB connector) and have more advantages, like:- power from any other wall power adapters (that supplies 6.5-20V and 1A at output), even if does not have USB connector.- reuse your old wall power adapters. Eg.: old notebook wall power adapter.- you can use batteries for powering your RPi. Eg.: 2, or more cells Lithium Polymer batteries or Lead GEL batteries, even from NiMH rechargeable or classic Alkaline batteries (more than 5) con...see more »Hi Rick,Not all power supplies can be used with Raspberry Pi. All version of RPi needs a stable power source with supplying voltage a little bit more than 5V (around 5.15V -> 5.25V), and current up to 1-1.5A. g-SPS 5V version fulfill those criteria. More of that, replicating this instructable, you can replace the standard way of powering Raspberry Pi (via USB connector) and have more advantages, like:- power from any other wall power adapters (that supplies 6.5-20V and 1A at output), even if does not have USB connector.- reuse your old wall power adapters. Eg.: old notebook wall power adapter.- you can use batteries for powering your RPi. Eg.: 2, or more cells Lithium Polymer batteries or Lead GEL batteries, even from NiMH rechargeable or classic Alkaline batteries (more than 5) connected in serial mode.- you can power some additional boards used together with RPi, from the same power supply.- other stuffs

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