Basic Electronic Queries

Question

Hi,I had following queries :

1.Are 1602 and 16*2 just different names for same LCD module?

2.How to identify whether the cheap LCD modules has HD44780 controller board inbuilt?

3. While operating DC brushed motor if it is specified 5v-9v ,what is safe operational voltage? 4. While operating DC brushed motor how to calculate amperage rating to prevent frying out power supply?

5.Which are best type of DC motor for attaching drill bits?

Awaiting for reply! Thank you!

Former Member · Answer

Just to add some more useful info on the LCD's - you can often buy them with an i2c backpack which can simplify their usage and reduce the amount of wires to connect to them considerably, by buying one with a backpack you also need not worry about the controller chip as the datasheet will list all of the commands you need to communicate with it through i2c.

mcb1 · Answer

1.Are 1602 and 16*2 just different names for same LCD module? Yes 2.How to identify whether the cheap LCD modules has HD44780 controller board inbuilt? Consult the manufacturers documentation for the module. Any supplier that is worth buying from will have this information ... if not find another that does. Mark

jw0752 · Answer

Hi Apoorva, I do not know the answer to your question on the LCD module but I will tell you what I know about the motor question. If the motor is rated for 5v to 9v this means that the motor will turn dependably at 5 volts and at 9 volts it will be at its full duty cycle voltage. More than 9 volts can be applied for short periods of time but the motor may spin faster than it is designed for when under no load. The current draw of the motor under any specific voltage will increase as load is applied to the motor. For example if we have a motor drawing 1 amp at 9 volts with no load and we make the motor spin a drill bit that is boring so that the drill bit slows the motor the current will increase. We could see the amperage go to 2 amps, 3 amps and so on as more load is applied to the motor. Ultimately too much load will stall the motor and we will get a stall current. This will quickly overheat and burn the windings in the motor. Your power supply will likely have a limit to the current that it can supply. This may prevent damage to the motor but it will also limit the power you can get out of the motor. Very few motors that I know of are designed to have drill bits attached directly. In most cases the motors are geared down so that the drill bit turns at a slower speed but has a lot more torque. This is of course exactly what is done in a battery powered hand drill. I do not know what you are building but will a battery powered hand drill work. You would have a DC motor and a drill chuck. John

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