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  1. E

    automatic measurement and compensation of glucose level

    Deal all I need to realize a system which measures continously blood glucose level with a biosensor, and then activate an insulin pump when the level is low or high etc. For that I am thinking to use a microcontroller to read the sensor and then send a signal to pump (or a valve to open and...
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    read NFC signal from a glucose sensor

    Dear all, I have a glucose sensor (Free style Libre- from Abbott) which can measure the glucose level of blood and send the data directly to my iphone ( via an application). The data is sent by NFC singal to my iphone. Now for some reasons I need to read the data myself with a computer and to...
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    connect high power signal to oscilloscope?

    Hello Sorry if the question is too basic for some of you. I have a voltage (10V ) but with current about 5 A. Therefore the power of this signal is 50W. I would like to know if I can connect it to the oscilloscope to see it? I am afraid to break something? And can I also see the current...
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    Industrial voltage divider

    Dear all, I need a simple voltage divider circuit to convert +24 V into +5 V. I can easily do that by building a circuit using 2 resistances. I would like to know if there are industrial dividers for this purpose. I am searching for a possible quick insallation DIN rail divider to do that...
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    Power rate of D'sub DB 25 cable

    Dear all, I have a cable Dsub Db 25 like this one. https://www.distrelec.ch/fr/pb-305-10-cable-sub-db25-maxxtro-pb-305-10/p/12530098?q=cable+d-sub+25&page=1&origPos=1&origPageSize=50&simi=95.12 I would like to use this cable to control a sensor with digital signals. The voltage rate is 24...
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    Choice of the cable for motor driver

    Dear all, I would like to use a stepper motor and the vendor gave me a driver for this motor. The driver has an input to connect the motor on to it (this input is composed from 4 entrance : phase A, phase A', Phase B, phase B'). I know that I should use 48 V supply voltage for this driver and...
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    Parasit effect at the input port of a microcontroller

    Dear all, I have a problem with my microcontroller. My mircocontroller should perform certain job when the satuts of an input port (lets say PORTB.RB1) is set to 1. So if (PORTB.RB1==) { // do the job } My problem: sometimes I receive paraist effect on the port. In other words sometimes...
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    How to change the frequency of AC mains supply

    Dear all, I have a pump. this pump should be connected directly to the mains AC supply of our building to work. It means that the pump needs 220 V and 50 Hz frequency to work. Now I would like to change the flow rate of the pump. The flow rate can be changed by changing the supply freuqncy...
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    effect of humidity on a PCBs

    Hello, Thank you for helping me. I have a PCB which works very good in normal conditions (20°C, low humidity). For some reasons I should use this PCB in a thermal chamber with relatively high degree of humidity. I figured out that some fucntions are not performed correctly. Can someone tell...
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    Connecting 2 different grounds related to 2 different voltage levels

    Dear all, I have a microcontroller (PIC) which I use to control : - A stepper motor using a driver circuit working on 5VDC - A force sensor working on 24 VDC The microcontroller controls both the motor and the sensor. I have connected the ground of the sensor, and the ground of my stepper...
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    Is there any internal resistor for the digital I/O of my device?

    Dear all, I have a new electronic device (torque sensor) which has a 25 pins digital I/O connector. The characteristics of this connector is shown in attached. I would like to use one of the pins (pin 15) which is an input, and I would like to send pulses of 24 VDC to it. In fact I need to...
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    connect 24 V digital signal to a microcontroller

    Hello, I have a digital signal between 0- 24 V. In terms of logic states I know that for Voltages between 0 … 5 V I have state '0' and for voltages between 15 … 24 V I have state '1'. I would like to use this signal as input of my TTL microcontroller (Pic18F). Could you please give me some...
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    How to connect a power supply to my connector

    Hello, I have recently got an electronic device (a type of torque sensor). In the delivery box, there is no power supply and no cable. In the data sheet its written that I should use a 230 VAC/24 VDC power supply with 5 VA power consumption. You can see a picture of the connector of my device...
  14. E

    measure the current of a short pulse

    Hello, I have a pulse generator, generating a voltage pulse of duration 2-3 milliseconds. The voltage is around 6.5 V when I connect a special PCB to this generator. I would like to measure the "current" which goes through this PCB. I think with multimeter I can not because its too fast. I dont...
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    Old RS-232 compatibility with new computers?

    Dear all, I have a problem with an old force sensor which has an RS232 output port. I would like to use this old sensor and connect it to a PC which I bought recently. So I use a RS232-USB adapter cable like this ...
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    How to connect a stepper motor to a bipolar driver

    Dear all, I have a big problem to connect my stepper motor to a bipolar dirver. On the driver I have several inputs including (pulse+, pulse-, direction +, direction -, enable +, enable -) etc. And the outputs: motor phase A, and phase B. Questions: 1) my motor has 6 wires. And I have only 4...
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    Control stepper motor with PIC, maximum output frequency of PIC

    Dear all, I would like to control a stepper motor using PIC18F. I have a driver circuit for this motor. The driver circuit allows me to give an input pulse to control the motor. To control the speed of the motor, I should be able to produce pulses with different frequencies. I have the...
  18. E

    threshold voltage of a MOS transistor

    Hello, I have a basic question: I would like to realize a switch (an interruptor) in a circuit, using a MOS transistor. I need to change the state of the switch, with a very low voltage (for ex. 1 V, or even 0.5 V). In other word: if I have input signal =0 --> switch OFF input...
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    Pulse delay circuit

    Hello, I am searching a circuit which can delay an input pulse to 0-30 ms. In other words, the input of the circuit is pulse of 80 V, with rising time=0. At the output of the circuit I would like to have the same pulse but with rising edge at time T (0-30 ms). I want to have a delay (T)...
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    How to have a single switch to open/close several lines at the same time

    Dear all, I would like to know if some one knows about a switch or a relay allowing to open/close several (precisely 18 contact line) at the same time? In fact, I want to have a single button to control all at the same time (if I press the button, 18 lines should become closed or opened). I can...
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