2-D sketch

components 

1 seed wheel

2. seed storage

3. funnel

4. Plough mechanism

5.chassis

6. leveler

7. water tank

8. peristaltic pump

9. connection box

flow chart for circuits

pump connection flow chart

seed wheel flow chart

dc motor (motion of bot) flow chart

leveller and plough flow chart

flow chart for liquid level sensor

complete flow chart

circuits

complete circuit

circuit for stepper motor(seed wheel)

circuit for servo motors (plough and leveler)

circuit for peristaltic pump and liquid level sensor

circuit for dc motor (bot movement)

3d components and assembly

Assembly

material selection and total cost

motor selection and adapter calculation

motor calculation

Calculations

Levler 

Mass=0.016 kg

force=mg=0.016X9.81=0.157 N

torque=F X r=0.157X0.16=0.02511 Nm= 0.02511X10.2=0.2511 kg cm

t max=0.2561X1.5=0.3842 kg cm

N=0.3842 X 1000/9.81=39.7 N=40rpm

voltage=3-7 V

Plough

mass=0.02kg

force=mg=0.02X9.81=0.1962 N

torque=F X r=0.196X0.2=0.039 Nm= 0.039X10.2=0.4 kg cm

t max=0.4X1.5=0.6 kg cm

N=0.6X100/9.81=60rpm

Voltage=4-6v

Seed wheel

mass=0.13+0.05=0.18kg

Force=0.18X9.81=1.4715N

Torque=F X r=1.4715X0.039=0.0573Nm=0.0573X10.2=0.573 kg cm

t max=0.573X1.5=0.8 kg cm

40 rpm

Voltage=3.3v

Chassis

mass=3.6kg~4kg

force=4X9.81X0.7=27.468 N

Torque=27.5X0.05=1.37 Nm=1.37X10.2=14 kg cm

Torque on one motor=3.5 kg cm

Voltage=12v

adapter selection

12V/1600mA|5V/1310mA

factor of safety=1.2

12V/1920mA|5V/1572mA

1. Servo MG995R:

   - Speed: 40 RPM

   - Operating Voltage: 4.8V to 7.2V

   - Stall Torque: 9.4 kg-cm (at 6V)

   - No-load Current: 170 mA (at 6V)

   - Stall Current: 1.5 A (at 6V)

2. Stepper 28BYJ-48:

   - Speed: 30 RPM (with appropriate driver)

   - Operating Voltage: 5V (typically)

   - Current per Phase: 240 mA (at 5V)

   - Steps per Revolution: 4096

3. DC Motors for Chassis:

   - Speed: 30 RPM

   - Operating Voltage: 6V to 12V

   - No-load Current: 100 mA (at 12V)

   - Stall Current: 1.2 A (at 12V)

   - Stall Torque: 1 kg-cm (at 12V)

4. Peristaltic Pump (12V):

   - Operating Voltage: 12V

   - Current: 500 mA to 1 A

   - Flow Rate: 100 mL/min to 500 mL/min

5. Power Adapter:

   - Output Voltage: 12V

   - Output Current: 2A